Question

a train running at the speed of 45 kilometre per hour is 400 metre long how long will it take to pass a vendor standing on the station platform

Answer 1

45km/hr=45 × 5/18 m/s
=12.5m/s
distance =speed ×time
=> time =distance /speed
=> t=400/12.5
=> t =32s

Answer 2

To pass a vendor standing on the platform the train must travel 400m.

45km=45000m/3600 sec=12.5m/sec

the train travels 12.5 m in 1 sec

∴, the train travels 400m in =1/12.5×400= 32 sec.