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    Question

    Two trains A and B, were proceeding in the same

    direction on parallel tracks at 23 km/hr and 77 km/hr respectively. A man noticed that it took exactly 15 seconds for the faster train to pass by him. What is the length of the faster train?
    A 300 m Correct Answer Incorrect Answer
    B 225 m Correct Answer Incorrect Answer
    C 150 m Correct Answer Incorrect Answer
    D 180 m Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Relative speed = (77 – 23) km/hr = 54 km/hr => 54 × (5/18) = 15 m/sec Length of the faster train = 15 × 15 = 225 m

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