Question

20. A 150 m long train is moving with a unitom velocity of 45 km/h. The time taken by the train to
cross a bridge of length 850 m is
a) 56 sec
b) se
50 sec
d) 92 sec​

Answer 1

Answer:

80 sec

Explanation:

According to the given question,

l = length of the train = 150 m

d = length of the bridge = 850 m

v = velocity = 45 km/h = 45×1000/3600

= 12.5 m/s

t = time

And we are asked to find the time taken to cross the bridge.

We know, to cross the bridge the train needs to cross the bridge and itself too thus,

• s = total distance = 150+850

• s = 1000 m

Again, we know

• distance = velocity×time

• time = distance/velocity

• t = s/v

Putting the values we get,

• t = 1000/12.5

• t = 80 sec.

Thus it will take 80 sec.