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Question

An object starts at A, and travels at a speed of 40 kmph for 5 hours. It comes to rest at B. Another object starts at A and moves towards B, an hour after the first object has started.
In order to reach the point B at the same time as the first object, with what speed must the second object travel?

A
40 kmh1
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B
25 kmh1
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C
50 kmh1
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D
22.22 kmh1
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Solution

The correct option is D 50 kmh1
Given:
Speed of first object =40kmh1
Time travelled by the first object = 5 h.

Distance between A and B = 40×5=200 km

Now, the second object starts after an hour.
To reach the point B at the same time as the first object, the first object should cover the distance between A and B in the remaining time.

Distance to be covered = 200 km
Remaining time = 4 h

Required speed = DistanceTime taken=2004=50kmh1

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