A trains 100 meters long, running at 36 kmph takes 25 second

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A trains 100 meters long, running at 36 kmph takes 25 second to pass a bridge. The length of the bridge is ?

1. 150 meter
2. 144 meter
3. 90 meter
4. 540 meter

Correct Option: A

Speed = 36 x (5/18) = 10 m/sec
Let the length of the bridge = L m
Distance covered = (100 + L) m
Time taken = 25 sec
∵ (100 + L ) / 25 = 10 m/sec
⇒ 100 + L = 250
∴ L = 150 meter