The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:

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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: Option C

Explanation:

Speed = 45 x 5 m/sec = 25 m/sec.
18 2

Time = 30 sec.

Let the length of bridge be x metres.

Then, 130 + x = 25
30 2

2(130 + x) = 750

x = 245 m.

Video Explanation: https://youtu.be/M_d8WufJWKc