Question

154 Length of platform which a train 400m long
travelling at 45km/hr can cross in 40
seconds is-​

Answer 1

Answer:

First Convert 72 km/hr to m/s

72×1000/(60×60) = 20 m/s

Time to cover 200 m bridge = 200 m/(20 m/s) => 10 s

Since length of the train is 400 m, the bridge can only hold half the length of the train. So the other half will take another 10 s.

So, 10 s + 10 s = 20 s

This is the simplest understandable solution and there are many ways to do it.

Hope it is helpful to you