Question

A train 50m long passes over a bridge at a speed of 30km/h . If it takes 36 seconds to cross the bridge, the length of the bridge will be

Answer 1

Answer:

Velocity v=30 km/h=30×

18

5

=8.3 m/s

Time taken to cross t=36 s

Let the length of bridge be L.

Distance covered by train to cross d=50+L

So, L+50=36×8.3

⟹ L≈250 m

Answer 2

Answer:

200 m

Step-by-step explanation:

The train covers in 36 secs a distance = the length of the train + length of the bridge + the length of the train. At 30 kmph, the distance covered in 36 sec = 36x30x1000/(60x60) = 300 m. If the length of the train is 50 m then the length of the bridge = 300–2x50 = 200 m.