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Middle Years

3.04 12 and 24 hour time

Worksheet
Time conversions
1

Convert the following times:

a

9 days to hours.

b

11 minutes to seconds.

c

36 hours to minutes.

d

24 hours to seconds.

e

240 seconds to minutes.

f

360 minutes to hours.

g

780 seconds to minutes.

h

780 minutes to hours.

2

Convert the following times:

a

05:30 to 12 hour time.

b

18:30 to 12 hour time.

c

10:30 am to 24 hour time.

d

9:15 pm to 24 hour time.

e

00:45 to 12 hour time.

f

13:59 to 12 hour time.

g

8:40 am to 24 hour time.

h

7:25 pm to 24 hour time.

Time calculations
3

Find the following times:

a

30 minutes after 9:30 am.

b

30 minutes after 11:40 pm.

c

9:30 am plus half an hour.

d

7:00 pm plus 24 minutes.

e

45 minutes after 11:20 am.

f

20 minutes after 3:50 pm.

g

10:30 am plus two and a half hours.

h

9:10 pm plus 63 minutes.

4

Find the time and day that is represented by the following:

a

19 hours and 20 minutes after 20:15 on Thursday.

b

17 hours and 15 minutes before 15:25 on Thursday.

c

22 hours and 58 minutes after 19:25 on Monday.

d

18 hours and 39 minutes before 14:12 on Monday.

e

Saturday 13:15 - 15 hours 18 minutes

f

Thursday 13:20 + 21 hours 59 minutes

5

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 7 minutes + 11 hours 34 minutes

j

7 hours 59 minutes + 12 hours 11 minutes

k

10 hours 33 minutes - 7 hours 57 minutes

l

10 hours 43 minutes - 2 hours 29 minutes

6

How many hours are there in a non-leap year?

Applications
7

Kate leaves her home at 11:15 am to visit her grandmother in a different state. She arrives at her grandmother's house at 5: 15 pm. How long was Kate's trip in hours?

8

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

9

Neil's swimming lesson went from 11:15 until midday. How many minutes was Neil's lesson?

10

A YouTube video started playing at 1:40 pm and finished at 2:18 pm. How long is the video in minutes?

11

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

12

Sally's cruise ticket says that it "begins at 10:00 am and ends at 2:00 pm. How long is the cruise in hours?

13

James leaves home at 4:00 pm and gets home at 8:00 pm. How many hours was James out?

14

Today is Dave's birthday and he just turned 9 years old.

a

Find his age in days. Assume there are 365 days in a year.

b

Find his age in hours.

c

Find his age in minutes.

d

Find his age in seconds.

15

The average person sleeps for 8 hours a night. How many weeks does the average person spend asleep over 5 years? Assume there are 365.25 days in a year. Give your answer to the nearest week.

16

If an average person showers for 6 minutes per day, find how many hours they spend showering in:

a

One year (assume non-leap year).

b

55 years (ignoring leap-years).

17

A train ride between two cities takes 6 hours and 49 minutes. If you leave one city at 21:40, at what time will you arrive at the other city? Express your answer in 24-hour time.

18

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.

19

Eileen starts watching a movie at 11:15 am, which goes for 3 hours and 45 minutes.

What time will the movie finish?

20

A computer starts updating at 1:00 pm. The update will go for 130 minutes. Find the time that the update will be finished.

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