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    Question

    A train passes two bridges of length 800 m and 450 m in

    200 sec and 120 sec respectively. The length of the train is:
    A 63 m Correct Answer Incorrect Answer
    B 75 m Correct Answer Incorrect Answer
    C 80 m Correct Answer Incorrect Answer
    D 100 m Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the length of train x m. Speed of train = (Length of train + length of bridge)/Time taken in crossing According to the question, => (x+800)/200 = (x+450)/120 => 120(x+800) = 200(x+450) => 3(x+800) = 5(x+450) => 3x + 2400 = 5x + 2250 => 5x−3x = 2400 −2250 =>2x = 150 => x = 150/2 = 75 m

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