Question

A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

Answer 1

here,
the distance to be covered by the train = the size of the train + the size of the bridge
> distance = 360 m + 140 m = 500m
so,
as we know that ,
time = distance/speed
>time =500/25/2. ( 45 kmph= 25 /2 m/s)
>time= 1000/25
>time= 40 secs

Answer 2

total dist = 140+360=500m
speed = 45km/h=12.5m/s
time =d/s
=500/12.5
=40s