Question

A train running at a speed of 45 km /h in 400 m long . How long will it take to pass a vendor standing on the station platform

Answer 1

Speed of train= 45km/h= 45×1000/3600=50/4m/s
Distance covered by train=400m
Time=Distance/speed
therefore,
Time takes by train=400×40/50
Time=32second

Answer 2

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

45km=45000m/3660 sec=12.5m/sec

the train travels 12.5 m in 1 sec

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