Cambridge International Mathematics

Assumed Knowledge (Number) 27

4 Calculate the following, expressing your answers

in hours, minutes and seconds:

a 1 h 19 min+2h 42 min+1h 7 min

b 4 h 51 min 16 s+2h 19 min 54 s

c 12 h¡ 7 h 55 min

d 5 h 23 min¡ 2 h 48 min

5

Example 38 Self Tutor

What is the time difference between 9 : 55 am and 1 : 25 pm?

9 : 55 am to 10 : 00 am=5min

10 : 00 am to 1 : 00 pm=3h

1 : 00 pm to 1 : 25 pm=25min

3 h 30 min

The time difference is 3 hours 30 minutes.

Example 39 Self Tutor

What is the time 312 hours after 10 : 40 am?

10 : 40 am+3^12 hours=10: 40 am+3h+30min

=1: 40 pm+30min

=2: 10 pm

6 Find the time difference between:

a 4 : 30 am and 6 : 55 am b 10 : 08 am and 5 : 52 pm

c 3 : 15 pm and 9 : 03 pm d 7 : 54 am and 2 : 29 pm

7 Henry left home at 7 : 48 am and arrived at work at 9 : 02 am. How long did it take him to get to work?

8 Your time schedule shows you worked the following hours last week:

Monday 8 : 45 am - 5 : 05 pm

Tuesday 8 : 50 am - 5 : 10 pm

Wednesday 8 : 45 am - 4 : 55 pm

Thursday 8 : 30 am - 5 : 00 pm

Friday 8 : 35 am - 5 : 15 pm

a How many hours did you work last week?

b If you are paidE 9 : 00 per hour, what was your income

for the week?

The abbreviation for

hours is and for

minutes is.

h

min

Xani has science lessons a week, each of minutes duration.

Find the total time spent in science lessons in a twelve week term.

645

IGCSE01

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