Question

A railway train 100m long passes over a bridge 400m long at the rate of 72km/h.How long will the train take to crush the bridge​

Answer 1

Explanation:

Hia buddy

kindly refer the pic I'm sending.....

Hope it helps uh!

Answer 2

hey mate ,

given ,

distance - 400 m + 100m ( length of train )= 500 m

speed = 72 km/h = 20 m/s

time = distance/speed

= 500/20

=25 second !!

Hope you find it helpful!!!