Question

A 120 m train running at 40 km/h will cross a bridge 80 m long?

Answer 1

Speed of train = 40km/hr.
" in m/sec = 5/18*40
= 100/9 m/sec.
Total distance to be covered = (120+80)
= 200m
Time = Distance /speed
= 200*9/100
18 seconds.

Hope that this will help you.