A boy sitting in a train which is travelling at 25 km/hr observes that a goods train travelling in oppositedirection, takes 4.5 seconds to pass him. If the train is 140 m long, find its speed.

A boy sitting in a train which is travelling at 25 km/hr observes that

1.	A boy sitting in a train which is travelling at 25 km/hr observes that a goods train travelling in oppositedirection, takes 4.5 seconds to pass him. If the train is 140 m long, find its speed.
A.	77 km/hr
B.	79 km/hr
C.	87km/hr
D.	89 km/hr
Answer» D. 89 km/hr

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A boy sitting in a train which is travelling at 25 km/hr observes that a goods train travelling in oppositedirection, takes 4.5 seconds to pass him. If the train is 140 m long, find its speed.

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