A train, 130 m long is running at the speed of 45 km/hr crosses a bridge in 30 seconds. What is the length of the bridge?

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    A train, 130 m long is running at the speed of 45 km/hr crosses a bridge in 30 seconds. What is the length of the bridge?

    A. 145 metres
    B. 245 metres
    C. 325 metres
    D. 215 metres

    Answer: Option B
    Explanation:
    The distance travelled by train to cross the bridges is equal to the total length of train and bridge.
    Speed = 45 x 5/18 m/sec = 25/2 m/sec.
    Time = 30 sec
    Total Distance Travelled = (25/2) x 30 = 375 m
    Length of the bridge = 375 -130= 245 m

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