Question

A train of length 100 m crosses a pole in 12 sec. and
crosses a platform in 72 sec. what is the length of the
platform ?
(a) 500 m
(b) 600 m
(C) 800 m
(d) None of these​

Answer 1

Hey,

Let suppose the pole as a point, and the length of the train is 100m as given, and we know that it crosses that pole in 10s.

• The formula to calculate velocity is = distance/time

(v = d/t) -> v - velocity, d - distance, t - time

• distance=100m, time=10s

• Velocity = 100/10 = 10m/s

• or 10×18/5 = 36km/h

Hope it helps you to understand this :)