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Question 68
A train 180 m long moving at the speed of 20 m/sec passes across a boy who is moving at a speed of 10 m/sec in the direction of the train. The time (in s) taken by the train to overtake the boy is:
Solution
A train 180 m long moving at the speed of 20 m/sec passes across a boy who is moving at a speed of 10 m/sec in the direction of the train.
Time taken by the train to overtake the boy =Â $$\frac{length\ of\ train}{relative\ speed}$$
=Â $$\frac{180}{20-10}$$
= $$\frac{180}{10}$$
= 18Â seconds
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