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Exercise 9.4

1. Write the time shown by the following watches.

(a) (b) (c)
11 12 1 11 12 1 11 12 1
10 2 10 2 10 2
9 3 9 3 9 3
8 4 8 4 8 4
7 6 5 7 6 5 7 6 5

2. Write the time in figures.
(a) 15 minutes 10 seconds past 11 (b) 9 minutes 45 seconds past 10

(c) 10 minutes 20 seconds past 6 (d) 4 minutes 16 seconds past 7
3. Gopal started yoga at 7:15 a.m. It was over at 7:50 a.m. How long did the yoga last?
4. A city bus started to move at 4 p.m. It reached the destination at 10:30 p.m. How long did
the bus move?

5. A football match started at 10:30 a.m. It ended at 12:45 p.m. How long did the match last?

6. Meenakshi and Akshita started their music practice at 6:50 a.m. and stopped it at 9:40 a.m.
How long did they practise?
7. Riya started reading a book at 11:40 a.m. She read for 2 hours 30 minutes. When did she
stop reading?
8. Nitin started playing basketball at 5:40 p.m. It ended at 7:30 p.m. How long did he play?

Conversions of Time

We know that— 1 day = 24 hours; 1 hour = 60 minutes; 1 minute = 60 seconds

Hours into Minutes

To convert hours into minutes, we multiply the hours by 60.

Minutes into Seconds

To convert minutes into seconds, we multiply the minutes by 60.

Let’s Attempt

Example 1: Convert 4 hours into minutes.

Solution: 1 hour = 60 minutes
4 hours = 4 × 60 minutes = 240 minutes