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SLIDE 1
What is the difference between the two times?
start end
start end
SLIDE 2
2:24 4:47
Difference: 2 hr 23 min
12:39 9:03
Difference: 8 hr 24 min
SLIDE 3
Example
Add 2 hr 27 min to 3: 45
There are 60 minutes in 1 hour. 72 min is 1 hr 12 min
Hence the final time is 6: 12
Exercise
? Add 3 hr 34 min to 4: 42
? Add 4 hr 47 min to 12: 15
? The first task took 1 hr 29 min
The second task took 2 hr 28 min
The third task took 4 hr 47 min
How long did all three tasks take?
SLIDE 4
? Add 3 hr 34 min to 4: 42
? Add 4 hr 47 min to 12: 15
12: 15 is the same as 0: 15 on a 12-hour clock
On a 24-hour clock the answer is 17: 02
? The first task took 1 hr 29 min. The second task took 2 hr 28 min. The third task took 4 hr 47 min. How long did all three tasks take?
104 min is 1 hr 44 min. The duration is 8 hr 44 min
(It is a duration that is asked for, not a time of day.)
SLIDE 5
The time now is 8: 12 p.m. You started watching War and Peace 3 hours 43 minutes earlier. When did you start watching War and Peace?
SLIDE 6
The time now is 8: 12 p.m. You started watching War and Peace 3 hours 43 minutes earlier. When did you start watching War and Peace?
We subtract 3 hr 43 min from 8: 12 p.m. To do this we make a sum and use the technique of “borrow one and add one”. But there are sixty minutes in 1 hour, so when we borrow the hour we show this as 6 + 1. (That is, as 70 minutes.)
It is useful to check all your calculations. On the left we add back 3 hr 43 min to 4: 29 p.m. to confirm that the calculation is correct – we get back to the current time of 8: 12 p.m.
Answer: You started watching War and Peace at 4: 29 p.m.
SLIDE 7
The time now is Thursday 05: 18 on the 24-hour clock. The Moon was last a full-moon 3 days 10 hours and 45 minutes ago. What was the day and the time on the 24-hour clock when the Moon was last full?
SLIDE 8
The time now is Thursday 05: 18 on the 24-hour clock. The Moon was last a full-moon 3 days 10 hours and 45 minutes ago. What was the day and the time on the 24-hour clock when the Moon was last full?
Solution
This question may be split into two parts: (a) What was the time on the day when the Moon was full? (b) What day of the week was it?
To answer the first part, we subtract 10: 45 from 05: 18
To do this we must borrow an hour and borrow a day – that is 24 hours. The result is 18:23 on the 24-hour clock, or 6:23 p.m. To check the calculation, we add 10: 45 to 18: 33 on the right and arrive back at 29: 18 or 5: 18 am.
The borrowing of the day indicates that we have gone back not 3 but 4 days and that the final answer is Sunday 18:33 (or Sunday 6:33 p.m.)
Sunday 18:33
SLIDE 9
The first task took 2 hr 57 min
The second task took 1 hr 29 min
The third task took 152 min
The time is now 5.15 p.m. When did I start the first task?
SLIDE 10
The first task took 2 hr 57 min. The second task took 1 hr 29 min. The third task took 152 min
The time is now 5.15 p.m. When did I start the first task?
Solution
We first find the total duration of the three tasks. We convert the 152 min to 2 hr 32 min. We then find the total duration. This is done on the left and comes to 6 hr 54 min.
We subtract 6: 54 from 5: 15 pm to arrive at 10:21 am.
On the right we check the subtraction by adding back 6:54 to 10:21. We arrive at 17:15 on the 24-hour clock, or 5: 15 p.m.
Answer: I started at 10: 21 am.
SLIDE 11
The year is divided into 12 months.
There are 365 days in a normal year, and 366 days in a Leap Year.
By working out the prime factorisation of 365 and 366 show that neither is divisible by 12, and hence that it is impossible to have twelve months with an equal number of days.
SLIDE 12
365 is an odd number and cannot be divisible by 12 which is even.
and both 5 and 73 are prime numbers.
Hence, 366 is divisible by 6 but not by 12.
Alternatively, the last two digits of 366 is 66, which is not divisible by 4; hence, 366 is not divisible by 4 and so cannot be divisible by 12.
SLIDE 13
The year is divided into twelve months
The following rhyme is used as a mnemonic to recall the number of days in a given month.
Thirty days has September,
April, June, and November,
All the rest have thirty-one,
But February's twenty-eight,
The LEAP YEAR, which comes once in four,
Gives February one day more.
Learn this mnemonic and use it to write out the calendar of a normal year. Confirm that a normal year has 365 days.
SLIDE 14
Thirty days has September,
April, June, and November,
All the rest have thirty-one,
But February's twenty-eight,
The LEAP YEAR, which comes once in four,
Gives February one day more.
January 31 July 31
February 28 August 31
March 31 September 30
April 30 October 31
May 31 November 30
June 30 December 31
SLIDE 15
In a certain year 1 January is a Wednesday. It is not a leap year.
? Assuming that each week begins on a Monday, make a calendar from 1 January to the end of April.
? What days of the week are 13 January and 25 April?
? How many full weeks are there between these two dates inclusive?
SLIDE 16
? Make a calendar from 1 January to the end of April.
January February
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 3 4 5 1 2
6 7 8 9 10 11 12 3 4 5 6 7 8 9
13 14 15 16 17 18 19 10 11 12 13 14 15 16
20 21 22 23 24 25 26 17 18 19 20 21 22 23
27 28 29 30 31 24 25 26 27 28
March April
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 1 2 3 4 5 6
3 4 5 6 7 8 9 7 8 9 10 11 12 13
10 11 12 13 14 15 16 14 15 16 17 18 19 20
17 18 19 20 21 22 23 21 22 23 24 25 26 27
24 25 26 27 28 29 30 28 29 30
31
? 13 January is a Monday. 25 April is a Friday.
? There are 14 full weeks between these two dates.
SLIDE 17
A shop sells chairs.
On 2 March the stock is 38 chairs. Every Monday the shop receives a delivery of 25 chairs. Throughout March sales average 3 units from Monday to Friday, and 5 units on Saturday and Sunday. The shop is closed owing to flooding between Tuesday 17 and Sat 21 March inclusive. What is the stock at the end of Tuesday 31 March?
SLIDE 18
A shop sells chairs. On 2 March the stock is 38 chairs. Every Monday the shop receives a delivery of 25 chairs. Throughout March sales average 3 units from Monday to Friday, and 5 units on Saturday and Sunday. The shop is closed owing to flooding between Tuesday 17 and Sat 21 March inclusive. What is the stock at the end of Tuesday 31 March?
Solution
There are 5 Mondays in March, so the stock received is
Number sold
Week 2 to 8
Week 9 to 15
Monday 16 3
Sunday 22 5
Week 23 to 29
Monday 30 3
Tuesday 31 3
Total sold 89
Net increase of stock
Stock at close chairs
SLIDE 19
July August
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
30 1 2 3 4 5 6 28 29 30 31 1 2 3
7 8 9 10 11 12 13 4 5 6 7 8 9 10
14 15 16 17 18 19 20 11 12 13 14 15 16 17
21 22 23 24 25 26 27 18 19 20 21 22 23 24
28 29 30 31 1 2 3 25 26 27 28 29 30 31
A trader makes money by buying and selling shares. There is no trading at the weekend. On Monday 7 July a trader had 100 shares in Company A, which were bought for £10 each. For each complete week in July the shares went up by £1 by Friday, and the trader sold 10 shares at the new price. Between Monday 28 and Friday 1 August the price did not change, but 20 shares were sold. For each complete week in August the price went down by £1 and the trader bought 10 shares at the new price. How many shares did the trader have by Sunday 31 August, and what was the difference between what the trader received and what the trader spent?
SLIDE 20
July August
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
30 1 2 3 4 5 6 28 29 30 31 1 2 3
7 8 9 10 11 12 13 4 5 6 7 8 9 10
14 15 16 17 18 19 20 11 12 13 14 15 16 17
21 22 23 24 25 26 27 18 19 20 21 22 23 24
28 29 30 31 1 2 3 25 26 27 28 29 30 31
A trader makes money by buying and selling shares. There is no trading at the weekend. On Monday 7 July a trader had 100 shares in Company A, which were bought for £10 each. For each complete week in July the shares went up by £1 by Friday, and the trader sold 10 shares at the new price. Between Monday 28 and Friday 1 August the price did not change, but 20 shares were sold. For each complete week in August the price went down by £1 and the trader bought 10 shares at the new price. How many shares did the trader have by Sunday 31 August, and what was the difference between what the trader received and what the trader spent?
Number Price / £ Received / £ Spent / £
Mo 7 July 100 10
Fr 11 July 90 11 11
Fr 28 July 80 12 12
Fr 1 Aug 60 12 24
Fr 8 Aug 70 11 11
Fr 15 Aug 80 10 10
Fri 22 Aug 90 9 9
Fri 29 Aug 100 8 8
Total 47 38
The trader had 100 shares on 29 August and received £9 more than he spent during this period.
SLIDE 19B
July August
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
30 1 2 3 4 5 6 28 29 30 31 1 2 3
7 8 9 10 11 12 13 4 5 6 7 8 9 10
14 15 16 17 18 19 20 11 12 13 14 15 16 17
21 22 23 24 25 26 27 18 19 20 21 22 23 24
28 29 30 31 1 2 3 25 26 27 28 29 30 31
A trader makes money by buying and selling shares. There is no trading at the weekend. On Monday 7 July a trader had 100 shares in Company A, which were bought for $10 each. For each complete week in July the shares went up by $1 by Friday, and the trader sold 10 shares at the new price. Between Monday 28 and Friday 1 August the price did not change, but 20 shares were sold. For each complete week in August the price went down by $1 and the trader bought 10 shares at the new price. How many shares did the trader have by Sunday 31 August, and what was the difference between what the trader received and what the trader spent?
SLIDE 20B
July August
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
30 1 2 3 4 5 6 28 29 30 31 1 2 3
7 8 9 10 11 12 13 4 5 6 7 8 9 10
14 15 16 17 18 19 20 11 12 13 14 15 16 17
21 22 23 24 25 26 27 18 19 20 21 22 23 24
28 29 30 31 1 2 3 25 26 27 28 29 30 31
Number Price / $ Received / $ Spent / $
Mo 7 July 100 10
Fr 11 July 90 11 11
Fr 28 July 80 12 12
Fr 1 Aug 60 12 24
Fr 8 Aug 70 11 11
Fr 15 Aug 80 10 10
Fri 22 Aug 90 9 9
Fri 29 Aug 100 8 8
Total 47 38
The trader had 100 shares on 29 August and received $9 more than he spent during this period.
SLIDE 21
A Spanish class begins at 3:45 p.m. It lasts for one-and-a-half hours. The presenter needs 20 minutes to set up before the class begins, and 20 minutes to pack away after the class finishes. When does the presenter start to set up, and when does the presenter finish packing away?
SLIDE 22
A Spanish class begins at 3:45 p.m. It lasts for one-and-a-half hours. The presenter needs 20 minutes to set up before the class begins, and 20 minutes to pack away after the class finishes. When does the presenter start to set up, and when does the presenter finish packing away?
Solution
Start: 3:25 pm. Finish: 5:35 pm.
SLIDE 23
Andy finishes work at 4 p.m. He plans to meet his friends at a sports bar at 8:15 p.m. He wants to go to the gym after work. Andy needs three quarters of a hour to get from work to the gym. He plans to spend 1 hour 15 minutes at the gym. He needs 25 minutes to get from the gym to his home. It will take 1 hour 10 minutes to shower and get changed. Andy needs 25 minutes to get from his home to the sports bar. Will Andy get to the sports bar on time?
SLIDE 24
Andy finishes work at 4 p.m. He plans to meet his friends at a sports bar at 8:15 p.m. He wants to go to the gym after work. Andy needs three quarters of a hour to get from work to the gym. He plans to spend 1 hour 15 minutes at the gym. He needs 25 minutes to get from the gym to his home. It will take 1 hour 10 minutes to shower and get changed. Andy needs 25 minutes to get from his home to the sports bar. Will Andy get to the sports bar on time?
Solution
4:00—finish work, 4:45—gym, 6:00—finish gym, 6:25—home, 7:35—leave house, 8:00—sports bar. Yes, he can make it with 15 min to spare.
SLIDE 25
This is part of a bus timetable between A and E.
A 07 25 07 55 08 15 08 30 08 45 09 05
B 07 35 08 03 08 23 08 38 08 55 09 13
C 07 47 08 16 08 36 08 50 09 05 09 27
D 07 57 08 27 08 45 09 00 09 16 09 38
E 08 05 08 35 08 55 09 10 09 25 09 48
In an effort to show that he is environmentally friendly, the State Governor will travel by bus from B to E. His wife, in front of television cameras, will take 10 minutes to say goodbye to him before his house. It takes 20 minutes to walk from his house to the bus stop at B. It takes 10 minutes to get from the bus stop at E to the Governor’s Office. The Governor will begin to say goodbye to his wife at 7.45 am. Will the Governor reach the Governor’s Office by 9 a.m.?
SLIDE 26
This is part of a bus timetable between A and E.
A 07 25 07 55 08 15 08 30 08 45 09 05
B 07 35 08 03 08 23 08 38 08 55 09 13
C 07 47 08 16 08 36 08 50 09 05 09 27
D 07 57 08 27 08 45 09 00 09 16 09 38
E 08 05 08 35 08 55 09 10 09 25 09 48
In an effort to show that he is environmentally friendly, the State Governor will travel by bus from B to E. His wife, in front of television cameras, will take 10 minutes to say goodbye to him before his house. It takes 20 minutes to walk from his house to the bus stop at B. It takes 10 minutes to get from the bus stop at E to the Governor’s Office. The Governor will begin to say goodbye to his wife at 7.45 am. Will the Governor reach the Governor’s Office by 9 a.m.?
Solution
He reaches the bus stop at B at 8:15, so he must wait for the 8:23 bus. He arrives at E at 8:55 and reaches the Office at 9:05, so he will be 5 minutes late.
SLIDE 27
Mary plans to meet her friend Sally at a café at 9 p.m. She finishes work at 6.30 p.m. She needs 35 minutes to get to her apartment, a further 1 hour 10 minutes to change clothes and do her make-up. It normally takes 35 minutes to reach the café, but today there is a 20-minute delay owing to roadworks. Will Mary be on time to meet Sally at the café at 9 p.m.?
SLIDE 28
Mary plans to meet her friend Sally at a café at 9 p.m. She finishes work at 6.30 p.m. She needs 35 minutes to get to her apartment, a further 1 hour 10 minutes to change clothes and do her make-up. It normally takes 35 minutes to reach the café, but today there is a 20-minute delay owing to roadworks. Will Mary be on time to meet Sally at the café at 9 p.m.?
Solution
Finish work 6:30
Apartment 7:05
Leave 8:15
Journey time min
Arrive 9:10
She will be 10 minutes late.
SLIDE 29
The diagram shows a network of five towns, with driving distances between them in minutes.
Jeff drives a delivery van. He will load the van at the warehouse at A. This will take 30 minutes. Then he will drive the following route:
A ? E ? C ? B ? D ? A
He will make deliveries at towns E, C, B and D, but no delivery at A. Each delivery requires 10 minutes. He wishes to return to the warehouse by 4:15 p.m.
What is the latest time that he can set out in order to return by 4.15 p.m.?
SLIDE 30
The diagram shows a network of five towns, with driving distances between them in minutes.
Jeff drives a delivery van. He will load the van at the warehouse at A. This will take 30 minutes. Then he will drive the following route:
A ? E ? C ? B ? D ? A
He will make deliveries at towns E, C, B and D, but no delivery at A. Each delivery requires 10 minutes. He wishes to return to the warehouse by 4:15 p.m. What is the latest time that he can set out in order to return by 4.15 p.m.?
Solution
Load the van at A 30
A ? E 20
E ? C 26
C ? B 33
B ? D 42
D ? A 30
Four deliveries 40
Total time needed 221 min = 3 hr 41 min
4: 15
3: 41 -
12: 34 p.m.
He should leave at 12: 34 p.m. at the latest.
SLIDE 30
Solution
Load the van at A 30
A ? E 20
E ? C 26
C ? B 33
B ? D 42
D ? A 30
Four deliveries 40
Total time needed 221 min = 3 hr 41 min
4: 15
3: 41 -
12: 34 p.m.
He should leave at 12: 34 p.m. at the latest.
SLIDE 31
A 06 29 06 52 07 16 07 28 07 55 08 28
B 06 37 07 02 07 26 07 38 08 07 08 40
C 07 28 07 53 08 15 08 28 08 57 09 30
D 08 05 08 25 08 57 09 03 09 34 10 04
E 09 38 09 54 10 23 10 35 11 10 11 35
Mr. Lincoln will leave his house at 6.25 a.m. It takes 27 minutes by car to reach Station B. It takes a further 12 minutes at Station B to park the car. He travels to Station D, where he gets off to meet with Mr. Maddison. They have coffee at Station D for at least 30 minutes and together go by the next train to Station E.
At what time will Mr. Lincoln and Mr. Maddison arrive at Station E? How long was his journey altogether?
SLIDE 32
A 06 29 06 52 07 16 07 28 07 55 08 28
B 06 37 07 02 07 26 07 38 08 07 08 40
C 07 28 07 53 08 15 08 28 08 57 09 30
D 08 05 08 25 08 57 09 03 09 34 10 04
E 09 38 09 54 10 23 10 35 11 10 11 35
Mr. Lincoln will leave his house at 6.25 a.m. It takes 27 minutes by car to reach Station B. It takes a further 12 minutes at Station B to park the car. He travels to Station D, where he gets off to meet with Mr. Maddison. They have coffee at Station D for at least 30 minutes and together go by the next train to Station E. At what time will Mr. Lincoln and Mr. Maddison arrive at Station E? How long was his journey altogether?
Solution
Leaves 06 25
Arrives at B 06 52 27 min
Parks car 07 04 12 min
Catches train 07 26
Arrives at D 08 57
Earliest leaving time 09 27 at least 30 min
Catches train 09 34
Arrives at E 11 10
Total journey time: min
285 min = 4 hr 45 min
SLIDE 33
Meat is sold in pounds weight, lb, as well as kilograms, kg. Pounds weight is part of the older system of imperial weights and measures, and is still used in day-to-day life, whereas measurement by kilograms is used in science. 1 lb weight is about half a kilogram weight.
A cookery book states that the cooking time of a roast turkey is 20 minutes per lb + 15 minutes.
The same book also states that the cooking time of a roast shoulder of pork is 30 minutes per lb + 30 minutes.
What is the difference in time between roasting a 4 lb turkey and a 3 lb joint of shoulder of pork?
SLIDE 34
A cookery book states that the cooking time of a roast turkey is 20 minutes per lb + 15 minutes.
The same book also states that the cooking time of a roast shoulder of pork is 30 minutes per lb + 30 minutes.
What is the difference in time between roasting a 4 lb turkey and a 3 lb joint of shoulder of pork?
Solution
Turkey min
Shoulder of pork min
The shoulder of pork takes min longer
SLIDE 33B
A cookery book states that the cooking time of a roast turkey is 20 minutes per lb + 15 minutes.
The same book also states that the cooking time of a roast shoulder of pork is 30 minutes per lb + 30 minutes.
What is the difference in time between roasting a 4 lb turkey and a 3 lb joint of shoulder of pork?
SLIDE 34B
A cookery book states that the cooking time of a roast turkey is 20 minutes per lb + 15 minutes.
The same book also states that the cooking time of a roast shoulder of pork is 30 minutes per lb + 30 minutes.
What is the difference in time between roasting a 4 lb turkey and a 3 lb joint of shoulder of pork?
Solution
Turkey min
Shoulder of pork min
The shoulder of pork takes min longer
SLIDE 35
The Earth orbits the Sun.
At the same time the Earth rotates on its own axis, which is tilted, so that it does not directly face the Sun.
The Sun is the source of light and is a ball of burning gas about 333,000 times larger than the Earth.
The orbit of the earth is not a perfect circle. The Earth is on average about 150 million kilometres from the Sun.
The Earth orbits the Sun in 365.26 days and rotates on its own axis in 23 h 56 min 4 s.
? Looking at the picture. If the time in Australia is midday, what is the time in the United Kingdom?
? The Sun rises in the East and sets in the West. Is the line between the dark side of the Earth and the light side sunrise or sunset?
? America is to the west of Europe. On any given day does sunrise come first in Europe or America?
SLIDE 36
? When it is midday in Australia it is midnight in the United Kingdom.
? The line running across the Earth in the picture shows sunrise. (India is to the east of Europe.)
? On any given day does sunrise comes first in Europe and later in America.
SLIDE 37
An imaginary line across the middle of the Earth that divides the Earth into two halves, north and south, is called the equator.
The northern half of the Earth is called the northern hemisphere and the southern half of the Earth is called the southern hemisphere.
Fact: there is more land mass in the northern hemisphere than in the southern hemisphere.
? Name the continents of the Earth, and classify which are mainly northern, and which are mainly southern continents?
? Where is it likely that most of the Earth’s population live?
SLIDE 38
Diagram by AlexCovarrubias, Wikipedia
? Northern continents: North America, Europe, Asia.
Southern continents: South America, Africa, Australia, Antarctica.
? Since there is more land mass in the northern hemisphere, we expect more people to live there, and this is the case.
SLIDE 39
The Arctic polar region lies above the Arctic circle
The Antarctic polar region lies below the Antarctic circle
The Earth is tilted on its own axis relative to the Sun
The Earth is rotating about its axis.
The seasons of the year are winter, spring, summer and autumn.
Use a diagram to explain how the orbit of the Earth around the Sun and its rotation about its axis accounts for the seasons.
SLIDE 40
As the Earth orbits the Sun, and because of the tilt of the rotation of the Earth, different parts of the surface of the Earth are illuminated by the light of the Sun.
When it is winter in the northern hemisphere, it is summer in the southern hemisphere, and vice-versa.
SLIDE 41
Midday is the time of day when the Sun is at its highest point in the sky.
? Explain why if it is midday in Europe it cannot be midday in America?
? Explain why the time of day must change from one continent to another.
? Explain why the Earth is divided into time zones.
SLIDE 42
This map shows some of the time zones into which the Earth has been divided by international agreement.
? It cannot be midday in America when it is midday in Europe because when the Sun is shining directly at Europe, it is not shining directly at America.
? The Sun rises later in America than it does in Europe. So, when it is 12 noon in the UK it is an earlier time in America. In fact, America and Europe are so large that they are both divided into several time zones.
? Since the Earth is a sphere, it is divided into time zones. We do not use a universal time for each part of the Earth, because that would be inconvenient.
SLIDE 43
Time in a time zone is given by reference to time GMT.
GMT is short for Greenwich Mean Time. The time in a time zone is plus (+) or minus (-) in hours from GMT.
When it is 12 p.m. in London, the time in New York is 7 am, because New York is -5 hours behind London.
? What is the time in (a) Los Angeles, (b) Mexico City and (c) Cairo, when the time in London is 12 pm?
? It is 4 pm in London. What is the time in (a) Los Angeles, (b) Mexico City, (c) New York and (d) Cairo?
? It is 3 pm in Los Angeles. What is the time in (a) Mexico City, (b) New York, (c) London and (d) Cairo?
SLIDE 44
? When the time in London is 12 pm
(a) Los Angeles, 12 - 8 = 4 am.
(b) Mexico City, 12 - 6 = 6 am.
(c) Cairo, 12 + 2 = 2 pm. (14:00 hrs.)
? When is 4 pm in London
(a) Los Angeles, 8 am, (b) Mexico City, 10 am.
(c) New York, 11 am, (d) Cairo, 6 pm
? When it is 3 pm in Los Angeles
(a) Mexico City, 5 pm, (b) New York, 6 pm
(c) London, 11 pm, (d) Cairo, 1 am
SLIDE 45
The diagram shows (a) in red, a line representing GMT 0 hrs, (b) in black, a line representing the International date line.
Any time to the left of GMT is minus hours from GMT and could be one day earlier.
Any time to the right of GMT is on the same day, but plus hours from GMT.
New Zealand is +12 GMT, and Alaska is -9 GMT.
? It is Monday 12:00 GMT in London (+0 GMT). What is the day and time in (a) New Zealand, (b) Alaska?
? It is Tuesday 8:00 GMT in London (+0 GMT). What is the day and time in (a) New Zealand, (b) Alaska?
? It is Saturday 3:00 GMT in London (+0 GMT). What is the day and time in (a) New Zealand, (b) Alaska?
SLIDE 46
? When it is Monday 12:00 GMT in London (+0 GMT)
(a) It is Monday 24:00 (12 pm) in New Zealand
(b) It is Monday 3:00 (3 am) in Alaska
? When it is Tuesday 8:00 GMT in London (+0 GMT)
(a) It is Tuesday 22:00 (10 pm) in New Zealand
(b) It is Monday 23:00 (11 pm) in Alaska
? When it is Saturday 3:00 GMT in London (+0 GMT)
(a) It is Saturday 15:00 (3 pm) in New Zealand
(b) It is Sunday 6:00 (6 am) in Alaska
SLIDE 47
? You are flying from London to New York.
Flight time is 7 hr 27 min. New York is -5 GMT. You set out at 3.30 pm. When do you arrive to New York?
? You are flying from London to Cairo.
Flight time is 4 hr 40 min. Cairo is +2 GMT. Your flight lifts off at 10.15 pm on Friday. When do you arrive to Cairo?
? You are flying from Los Angeles to Cairo. You take a first flight from Los Angeles to New York, and a second flight from New York to Cairo. You start at Los Angeles at 11.30 a.m. on Tuesday morning. The flight time from Los Angeles to New York is 6 h 9 min. The flight time from New York to Cairo is 11 h 54 min. The stopover at New York is 2 h 15 min. Make a schedule showing departure and arrival times from Los Angeles to Cairo. Los Angeles is -8 GMT, New York -5 GMT and Cairo is +2 GMT.
SLIDE 48
? You are flying from London to New York. Flight time is 7 hr 27 min. New York is -5 GMT. You set out at 3.30 pm. When do you arrive to New York?
. You arrive at 5:50 pm.
? You are flying from London to Cairo. Flight time is 4 hr 40 min. Cairo is +2 GMT. Your flight lifts off at 10.15 pm on Friday. When do you arrive to Cairo?
You arrive at 4:55 a.m. on Saturday.
? You are flying from Los Angeles to Cairo. You take a first flight from Los Angeles to New York, and a second flight from New York to Cairo. You start at Los Angeles at 11.30 a.m. on Tuesday morning. The flight time from Los Angeles to New York is 6 h 9 min. The flight time from New York to Cairo is 11 h 54 min. The stopover at New York is 2 h 15 min. Make a schedule showing departure and arrival times from Los Angeles to Cairo. Los Angeles is -8 GMT, New York -5 GMT and Cairo is + 2 GMT.
Depart Los Angeles Tuesday 11:30
Increase of time:
Arrive New York Tuesday 20:39
Depart New York Tuesday 22:54
Increase of time: next day
Arrive Cairo Wednesday 17:48
SLIDE 49
You are flying from Los Angeles to Cairo via Tokyo. You take a first flight from Los Angeles to Tokyo, and a second flight from Tokyo to Cairo. You start at Los Angeles at 11.30 a.m. on Tuesday morning. The flight time from Los Angeles to Tokyo is 11 h 28 min. The flight time from Tokyo to Cairo is 12 h 25 min. The stopover at Tokyo is 2 h 15 min. Make a schedule showing departure and arrival times from Los Angeles to Cairo. Los Angeles is -8 GMT, Tokyo +9 GMT and Cairo is +2 GMT.
SLIDE 50
You are flying from Los Angeles to Cairo via Tokyo. You take a first flight from Los Angeles to Tokyo, and a second flight from Tokyo to Cairo. You start at Los Angeles at 11.30 a.m. on Tuesday morning. The flight time from Los Angeles to Tokyo is 11 h 28 min. The flight time from Tokyo to Cairo is 12 h 25 min. The stopover at Tokyo is 2 h 15 min. Make a schedule showing departure and arrival times from Los Angeles to Cairo. Los Angeles is -8 GMT, Tokyo +9 GMT and Cairo is +2 GMT.
Depart Los Angeles Tuesday 11:30
Difference in time-zone
If you cross the international date line, then add 24. Alternatively, differences in time zone are measured from west to east. You cannot go backwards in time!
Increase in time
next day
Arrive Tokyo Wednesday 15:58
Depart Tokyo Wednesday 18:23
Difference in time-zone
Increase in time
Arrive Cairo Wednesday 20:48
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