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\ 10-Nov-2025 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________

Exercise 11G

1. Add the following:

a. 35 min 38 s and 18 min 17 s. b. 24 min 18 s and 5 min 20 s.

c. 28 min 38 s and 29 min 40 s. d. 15 min 30 s and 30 min 35 s.
e. 16 h 35 min 10 s and 25 h 16 min 20 s. f. 100 h 45 min 56 s and 5 h 19 min 12 s.

2. Find the difference between:

a. 25 h 24 min and 10 h 9 min. b. 24 h 38 min and 9 h 40 min.

c. 10 min 6 s and 5 min 26 s. d. 24 h 40 min 10 s and 4 h 56 min 16 s.
3. Ram travelled 15 hours 20 minutes by one bus and 13 hours 54 minutes by another
bus. For how much time did he travel in total?

4. Nitu’s mother takes 42 minutes 12 seconds to make dal
and 53 minutes 28 seconds to make chapatis. In how
much time will her lunch be ready?

5. Putul takes 55 minutes 20 seconds to complete her
homework. Her brother Ajay takes 1 hour 10 minutes
20 seconds to complete his homework. Who takes a longer time to complete their

homework and by how much?

 a.m. (ante-meridiem): Denotes time from 12 midnight to 12 noon.
 p.m. (post-meridiem): Denotes time from 12 noon to 12 midnight.
 The 24-hour clock tells the time using 4 digits (HHMM).
• The first two digits show hours (00 to 23).

• The last two digits show minutes (00 to 59).
• For p.m. times (after noon), typically add 12 to the hour
(e.g., 3:00 p.m. = 03:00 + 12:00 = 15:00 hours).
 Time can be converted between different units using standard relationships:
1 minute = 60 seconds, 1 hour = 60 minutes, 1 day = 24 hours, 1 week = 7 days.
 The above relationships can be used, when needed, to regroup in the addition and
subtraction of time.

194 Mathematics 4