Question

A 400 m long train is to cross a Railway Bridge over river if the bridge is 2.1 km long and the train passes over the bridge at uniform speed of 36 km per hour how much time does the train take to cross the bridge

Answer 1

total distance=2100+400 m
time =distance /speed
speed =36km/h
=36* 5/18 m/s
=10 m/s
therefore,
time =2500/10
=250 m/s