Question

a train 100m long is to cross a river bridge of length 800 what time will it take to cross the bridge given that the train moves with a constant velocity of 36 kilometres per hour ​

Answer 1

Answer:

90 sec

Explanation:

According to the given question,

v = velocity = 36 km/h = 36×1000/3600 = 10 m/s

Here velocity is constant thus it can be treated as speed.

l = length of train = 100 m

s = length of bridge = 800 m

t = time

And we are asked to find the time required to cross through the bridge.

Here, to cross the bridge; train have to cross itself too.

Thus, d = total distance = l+s = 100+800 = 900 m

We know,

time = distance/velocity

t = d/v

Putting the values we get,

t = 900/10

t = 90 sec

Thus, train will take 90 sec to cross the bridge.

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