Question

A train passes over a 400 m long bridge with the speed of the train is 30 m per second and the train takes20seconds to cross the bridge then the length of the train is

Answer 1

let the length of the train X metre there for 400 + X equal Total distance
according to the question 400 + X upon 30 equal 20 seconds 400 + X = 600 X equal 200

the length of the train is 200 m