The length of the bridge, which a train 130 m long and travelling at 45 km h - 1 can cross in 30 seconds, is:

Question

The length of the bridge, which a train 130 m long and travelling at 45 km h - 1 can cross in 30 seconds, is:, 200 m, 225 m, 245 m, 250 m

MARKS App · Accepted Answer

Speed = 45 × 5 18 m s - 1 ⇒ 25 2 m s - 2 ; T i m e = 30 s . Let the length of the bridge be x metres. Then, 130 + x 30 = 25 2 ⇔ 2 ( 130 + x ) = 750 ⇔ x = 245 m

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