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iGCSE (2021 Edition)

15.02 Time intervals

Worksheet
Adding and subtracting time
1

Evaluate the following in hours and minutes:

a

11 hours - \, 43 minutes

b

11 hours 16 minutes - \, 5 hours

c

5 hours 10 minutes + \, 20 minutes

d

4 hours 10 minutes - \, 35 minutes

e

3 hours 3 minutes + \, 3 hours 29 minutes

f

3 hours 20 minutes - \, 2 hours 10 minutes

g

2 hours 50 minutes + \, 3 hours 40 minutes

h

6 hours 10 minutes - \, 2 hours 30 minutes

i

7 hours 59 minutes + \, 12 hours 11 minutes

j

10 hours 33 minutes - \, 7 hours 57 minutes

k

10 hours 43 minutes - \, 2 hours 29 minutes

2

How many hours and minutes left until midnight if the time is 16:50?

3

Find the following times, expressing your answer in 24-hour time:

a

4 hours after 16:28

b

7 hours after 22:53

c

12 hours before 9:57

d

13 hours before 10:43

e

30 minutes after 9:30 am.

f

30 minutes after 11:40 pm.

g

9:30 am plus half an hour.

h

7:00 pm plus 24 minutes.

i

45 minutes after 11:20 am.

j

20 minutes after 3:50 pm.

k

10:30 am plus two and a half hours.

l

9:10 pm plus 63 minutes.

4

Find the 24-hour time and day after evaluating the following:

a

Saturday 13:15 - \, 15 hours 18 minutes

b

Thursday 13:20 + \, 21 hours 59 minutes

5

James went to a movie at 11:50 am. The movie went for 1 hour and 10 minutes. What time will be it when the movie finishes? Write your answer using 12-hour time.

6

Sharon starts watching a movie at half past eleven am, which goes for 2 hours and 30 minutes. What time will be it when the movie finishes? Write your answer using 12-hour time.

7

Valentina starts work at 7 am and finishes work at 5:30 in the evening. How many hours and minutes is Valentina at work?

8

A train ride between two cities takes 9 hours and 57 minutes. On a train ride between these cities, if you leave one city at 23:44, at what time will you arrive at the other city? Give your answer in 24-hour time.

9

In a relay of four runners, Karen ran for 1:46, Janet ran for 1:18, Tania ran for 1:16 and Tina ran for 1:42. How long was their total time for the relay?

10

A ship arrives at 17:28 at Melbourne. If the trip took 2 hours and 16 minutes, at what time did the ship depart from Sydney? Express your answer in 24-hour time.

Time between events
11

James leaves home at 2 pm and gets home at 5 pm. How many hours was James out?

12

Luke starts school at 9 am and finishes at 3 pm. How many hours is Luke at school each day?

13

Ellie's family leaves her home at 9:17 am to visit her grandmother in a different state. She arrives at her grandmother's house at 3:17 pm. How long did the trip take?

14

A song clip starts playing at 7:55 pm and finished at 8:11 pm. How long is the song clip in minutes?

15

A taxi departs at 13:32 from Sydney and arrives at 20:14 at Melbourne. How long did the taxi take for the trip?

16

A match of hockey begins at 7:31 and finishes at 8:55. If the half-time break goes for 15 minutes, what is the duration of one half of hockey?

Time zones in Australia
17

Consider the map below:

a

Determine the time in Perth when it is 6:42 pm in Hobart.

b

Complete the table to show the equivalent time in each state:

Western Australia (WA)South Australia (SA)Queensland (QLD)
6:15
11:45
10:15
5:25
c

Complete the following table to show the equivalent time in each time zone:

WSTCSTEST
5:25
5:11
12:25
7:17
18

If it is 4:00 pm Daylight Savings Time (DST) in South Australia (SA), determine the time in:

a

New South Wales (NSW).

b

Western Australia (WA).

c

Queensland.

d

Northern Territory (NT).

19

Australia is divided into 3 time zones:

  • AEST (Eastern Standard Time) encompasses QLD, NSW, the ACT, VIC and TAS.

  • ACST (Central Standard Time) encompasses the NT and SA, and is half an hour behind AEST.

  • AWST (Western Standard Time) encompasses WA and is two hours behind AEST.

a

If it is 12:10 am AEST, determine the following, giving your answers in 24-hour time:

i

The time in ACST.

ii

The time in AWST.

b

If it is 1:16 pm in ACST, determine the time in AWST.

20

Han and Amelia board a train at 8:52 pm on Thursday from Sydney, New South Wales towards Adelaide, South Australia.

a

They arrived in Adelaide, South Australia on 6:48 pm Friday. Determine the duration of their train trip.

b

Han boards a train from Adelaide, South Australia at 8:43 pm on Friday to Darwin, Northern Territory. He arrives at 8:11 pm Saturday. Determine the duration of his trip.

c

Amelia boards a train from Adelaide, South Australia at 7:53 pm Friday towards Perth, Western Australia. She arrives at 10:54 am. Determine the duration of her train trip.

21

The map below shows the time zones across the Australian States in standard time and daylight saving time:

Calculate the flight times of the following trips:

a

The airplane leaves Broome Airport in Western Australia at 7:30 pm and arrives at Albury (operating on daylight savings time) Airport in Victoria at 3:52 am.

b

The airplane leaves Albury Airport in Victoria at 7:14 pm and arrives at Adelaide Airport in South Australia (operating on daylight savings time) at 9:10 pm.

c

The airplane leaves Adelaide Airport in South Australia at 9:53 am and arrives at Broome Airport in Western Australia(operating in daylight savings time) at 3:41 pm.

22

If it is 16:14 in Sydney in Daylight Savings Time, determine the time it would be in Eastern Standard Time.

23

Determine the time it would be in Eastern Standard Time for the following:

a

2:49 am in Sydney in Daylight Savings Time.

b

11:50 pm in Sydney in Daylight Savings Time.

24

If it is 14:35 in Sydney in Eastern Standard Time, determine the time it would be in Daylight Savings Time.

25

Determine the time it would be in Daylight Saving Time for the following:

a

9:45 am in Sydney in Eastern Standard Time.

b

5:13 pm in Sydney in Eastern Standard Time.

26

If it is 4 am in standard time, what time is it in daylight savings time (DST)?

27

If it is 8 am in daylight savings time (DST), what time is it in standard time?

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Outcomes

0580C1.14

Calculate times in terms of the 24-hour and 12-hour clock. Read clocks, dials and timetables.

0580E1.14

Calculate times in terms of the 24-hour and 12-hour clock. Read clocks, dials and timetables.

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