Page 142 - Maths Class 05

Time Duration (In Minutes)

Example : Rita left for Naira’s house at 7:30 p.m. She reached Naira’s house at 8:10

p.m. How long did it take her on the way ?

Solution : 7 : 30 p.m. Õ 8 : 00 p.m. Õ 8 : 10 p.m.
30 min + 30 min

It took Rita 40 minutes to reach Naira’s house.

Time Duration (In Hours and Minutes)

Example : Uma’s flight took off from New Delhi at 11 : 15 in the morning (11 : 15
a.m.). When it arrived in Mumbai, her watch read 1 : 32 in the afternoon (1

: 32 p.m.). How long was the flight ?

Solution : Look at the clocks.

Count the number of hours from 11 : 15 to 1 : 15. It is 2 hours.

Count by 5s and 1s to count the minutes from 1 : 15 to 1 : 32. It is 17 minutes.

The flight was 2 hours and 17 minutes long.

Example : Andy left his home for school at 6:30 a.m. He reached school after 40
minutes. At what time did he reach school ?

Solution : 6:30 a.m. + (30 minutes + 10 minutes) = 7 : 00 a.m. + 10 minutes
= 7 : 10 a.m.

Hence, Andy reached school at 7 : 10 a.m.

Practice - 7.5
Practice - 7.5
Practice - 7.5
Practice - 7.5
Solve the following word problems.
1. Priya started her homework at 7:20 p.m. She finished it at 8:05 p.m. How long did
she take to do her homework ?

2. A chess game started at 10:20 a.m. and ended at 12:30 p.m. How long did the
game last ?

3. Peter opened his shop at 9:30 a.m. and closed it at 8:00 p.m., everyday. How long
did the shop open ?

4. It takes 1 h 5 min for Vikas to travel from home to his office. If he wants to reach

the office at 8:30 a.m. At what time should he leave his house ?
5. A bus travels from Town A to Town B. It leaves Town A at 9:30 a.m., Monday. The
journey takes 26 h 20 min. When would the bus arrive in Town B ?

Mathematics-5 142