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    Question

    How many seconds will a train 60 m in length, travelling

    at the rate of 40 km an hour, take to pass another train 90 m long, proceeding in the same direction at the rate of 28 km an hour?
    A 45 sec Correct Answer Incorrect Answer
    B 44.4 sec Correct Answer Incorrect Answer
    C 48 sec Correct Answer Incorrect Answer
    D 43.8 sec Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Relative speed = 40 – 28 = 12 km/hr Speed (m/sec) = 12 × (5/18) = 10/3 m/sec Time = Total length of both the trains/Relative speed => Time = (90 + 60)/(10/3) = 45 sec

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