Question

There is a train 200 metres long which is running at a speed of 25 m/s ;it will cross a bridge of 100 metres long in how much time?

Answer 1

Hello friend....!!

• In this question, we should calculate the time taken by the train to pass the bridge

• speed = distance / time taken

Distance = 100 + 200 = 300m
( length of train and bridge)

Speed = 25 m/s^2

• therefore,

Time = distance / speed

Time = 300 / 25

Time = 12 seconds

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Hope it helps....!!

Answer 2

Hey there

Let l be the length of the train and t be the time

Total length , l = 200 m + 100 m [ Length of the bridge is also counted ]

speed of the running train , s = 25 m/s


We know ,

speed = distance / time

time = distance /speed

t = l /s

t = 300 / 25

t = 12 second [ since unit of the time is second ]

• Therefore it will take 12 seconds