Page 135 - ICSE Math 7

–1
2. A train 350 m long is travelling with a uniform speed of 45 km h . How much time will it take
to pass a:
(a) person. (b) 250 m long bridge.
–1
3. The speed of a stream is 4.2 km h . If a boat travels 51.1 km downstream in 3.5 hours, determine
the speed of the boat in still water.
–1
4. A train travels from city A to city B with an average speed of 60 km h and returns from city B
–1
to city A with an average speed of 75 km h . Find the distance between the two towns if it takes
12 hours to complete the whole journey.
7 1
5. Ananya driving at of her usual speed takes 2 hours less to reach a particular destination. Find
4
3
the usual time taken by her.
–1
6. A boat travelling at 40 km h leaves Port A at 12:00 p.m. and another boat leaves the same port
–1
in the same direction at 3:30 p.m. at 65 km h . How many kilometres from port A and in how
much time will they meet?
–1
7. A person is running parallel to a railway line at a speed of 15 km h . A train travelling in the
–1
opposite direction at a speed of 66 km h takes 14 seconds to cross him. Find the length of the
train.
–1
8. Two trains start moving at the same time from two stations towards each other at 50 km h and
–1
65 km h respectively. When they meet, one train has travelled 52.5 km more than the other.
Find the distance between the two stations.

THINK SMART

–1
–1
1. A bike covers a certain distance at 30 km h . It can cover 25 km more at 40 km h , how much
distance does the bike cover?
2. A tyre of car covers 1.2 m in a revolution. Find the speed of car if each tyre revolves 2,500 times
in 5 minutes.

121