Question

a train 150 metre long is running at 72 kilometre per hour it crosses a bridge in 13 seconds find the length of the bridge​

Answer 1

Length of the bridge = 110 m

Explanation:

Let the length of the bridge be x m.

Total distance covered by train in 13 sec = length of train + length of bridge = (150 + x) m

`speed \: of \: train \\ = 72 \: kmph \\ = 72 * (1000)/(3600) \: mps \\ = 20 \: mps \\ \because \: distance = speed * time \\ \therefore \: 150 + x = 20 * 13 \\ \therefore \: 150 + x = 260 \\ \therefore \:x = 260 - 150 \\ \huge \red{ \boxed{\therefore \:x = 110 \: m}}`

mps means meter per second