Question

a train 250m long passed a telegraph post in 60 sec .what is the speed of the train in km/hr

Answer 1

A train only passes its own length when it crosses a telegraph post.

So, in 60 sec it passes 250 m
in 3600 s it passes (3600×250)/60 = 15000 m

3600 s = 1 h
15000 m = 15000/1000 = 15 km

So, the speed of the train is= 15 km/h

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