Question

a train is moving with a constant speed crosses a stationary pole in 4 seconds and a platform 75 M long in 9 seconds the length of the train in metres is

Answer 1

let x be the length of train in meters and y be the speed of train in m/s.

now the train passes of length x meters having y speed passes the pole in 2 sec.

therefore…

x/y = 2,

now y=x/2.

and now same train passes the bridge in 7 seconds having length 250m..

now,

(x+250)/7 = y

but y=x/2… therefore..

(x+250/7) = x/2..

solving this we get x=(length of train)=100 m.