Page 141 - Maths Class 05

Word Problems on Subtraction

Example : Rinky left for her school at 6:35 a.m. She reached the school at 7:25 a.m.
How much time did Rinky take to reach the school ?

Solution : Rinky reached her school at 7:25 a.m.

She left for her school at 6:35 a.m. hr min
Time taken by her to reach the school 6 60
85
= 7 hr 25 min – 6 hr 35 min 7 25

= 0 hr 50 min + 6 35

Therefore, time taken by Rinky to reach the school 0 50

is 50 minutes.

Example : A normal car takes 2 hours 10 minutes 7 seconds to travel a certain
distance. A sports car takes 1 hour 49 minutes 5 seconds to travel same

distance. How much time do you save by travelling on sports car ?
Solution : Time taken by normal car = 2 hours 10 minutes 7 seconds

Time taken by sports car = 1 hour 49 minutes 5 seconds

Hours Minutes Seconds

1 60 min 70
Time saved = 2 10 7
– 1 49

0 hrs. 21 min. 2 sec.

\ 21 minutes 2 seconds are saved by travelling by sports car.

Practice - 7.4
Practice - 7.4
Practice - 7.4
Practice - 7.4
1. Sonu wake up at 6 a.m. in the morning. He sleeps at 9 p.m. in the night. For how many
hours he remains awake in a day ?

2. The aeroplane was about to leave at 5:15 p.m. It was late by 1 hour 45 minutes. What
time did it leave ?
3. Mohan could swim a particular length in 3 minutes 22 seconds. After some practice, he
could swim the same length in 2 minutes 40 seconds. By how much time had his speed
improved ?
4. On Monday, Megha took 2 hours 10 minutes to complete her homework. On Tuesday, she

took 1 hour 40 minutes to do her homework. How much longer did she take on Monday ?
5. Suraj takes 5 minutes to eat his lunch. Sumit takes 430 seconds to eat his lunch. Who eats
his lunch faster ?
6. Khanak travelled 2 km of distance in 5 minutes. Komal travels same distance in 360

seconds. Who travels faster and by how many seconds ?

Mathematics-5 141