Question

A 130m long train crosses a bridge in 30 seconds at 45 kmph. the length of the bridge is

Answer 1

time required to cross the bridge is 30 sec

speed of any point on the train is 45 kmph i.e

12.5 m/s

length of the bridge shall be the product of speed of train and the time required to cross the bridge

L=12.5 × 30 = 375m or 0.375 km