Question

A train take 10 seconds to cross a bridge of length 100m travelling at 90 kmph.find the length of the train in metres​

Answer 1

lenth of train is 150 metre

Answer 2

Let the length of train be L. Total distance required for the train to cross the bridge is,

d = (L + 100) m

The speed of the train is,

v = 90 km/h = 90 × 5 / 18 = 25 m/s

Then,

10 × 25 = L + 100

250 = L + 100

L = 150 m