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    Question

    A train 500 m long running at 90 km/hr takes 40 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

    Solution

    Speed of train = 90 km/hr = 90 × (5 / 18) = 25 m / sec If the length of bridge be x metre, then ⇒ 25 = (500 + x)/40 ⇒ 500 + x = 1000 ⇒ x = 1000 – 500 = 500 metre

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