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    Question

    A train 450 m long running at 72 km/hr takes 45 seconds

    to cross a bridge The length of the bridge is
    A 250 metre Correct Answer Incorrect Answer
    B 450 metre Correct Answer Incorrect Answer
    C 400 metre Correct Answer Incorrect Answer
    D 500 metre Correct Answer Incorrect Answer
    E 700 metre Correct Answer Incorrect Answer

    Solution

    Speed of train = 72 km/hr = 72 × (5 / 18) = 20 m / sec If the length of bridge be x metre, then ⇒ 20 = (450 + x)/45 ⇒ 450 + x = 900 ⇒ x = 900 – 450 = 450 metre

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