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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?
  1. 40 kmh1
  2. 22.22 kmh1
  3. 25 kmh1
  4. 50 kmh1


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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