Question

The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
A. 200 m B. 225 m
C. 245 m D. 250 m

Answer 1

@Noemi95

Answer 2

Let x be the length of the bridge.
The engine would first need to cross the bridge, and then another 130 m (length of the train) so that the entire train crosses the bridge.
So distance to be covered = x + 130
And all this needs to be done in 30 seconds
Speed = (x + 130) / 30
Given speed = 45 km/hr = 12.5 m/s
(x + 130) / 30 = 12.5
x + 130 = 375
x = 245 m