Page 146 - Mathematics Coursebook

15.1 The 12-hour and 24-hour clock

) Exercise 15.1

1 Write these as 24-hour clock times.
a 7 15 am b 10 45 am c 3 35 pm d 8 pm e 11 30 am f 11 30 pm
2 Write these times using the 12-hour clock
a 09 30 b 16 00 c 21 40 d 00 45 e 23 10 f 12 05
3 How long is it:
a from 08 30 to 09 15 b from 13 49 to 14 22 c from 17 42 to 18 11?
4 How long is it:
a from 8 25 am to 11 08 am b from 11 30 am to 2 45 pm c from 9 30 am to 7 15 pm?

5 A train left at 10 35 and arrived at 12 10. How long did the journey take?
6 A car left at 13 50 and arrived at 18 15.
a How long did the journey take?
1
b The driver took one break, for 1 hours. How long was she driving?
2
7 A train left at 22 47 and arrived at its destination the next morning at 06 33. How long did the
journey take?

8 A car left at 09 45. The journey took 25 minutes. Work out when it arrived.
9 A plane took off at 11 55 and arrived 2 hours 40 minutes later. What time did it arrive?

10 A traveller arrived at 17 25. The journey took 5 hours and 50 minutes. What time did the
traveller start?

11 The time in Wellington is 11 hours ahead of the time in London. What time is it in Wellington
when it is 6 15 am in London?
1
12 The time in Abuja is 4 hours behind the time in Delhi.
2
a What time is it in Abuja when it is 18 20 in Delhi? When it is midday in
1
The time in Jakarta is 1 hour ahead of the time in Delhi: Delhi it will be early
2
b What time is it in Abuja when it is 01 05 in Jakarta? morning in Abuja.

A plane left Cairo at 16 45 and arrived in Abu Dhabi 3 hours and 40 minutes later.
13 A plane left Cairo at 16 45 and arrived in Abu Dhabi 3 hours and 40 minutes later.
Abu Dhabi is 2 hours ahead of Cairo. What time did the plane arrive?

15 Time 145