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    Question

    A 150-meter-long train requires 'p' seconds to pass a

    tree. When the train runs at 75% of its original speed, it takes 20 seconds to pass a 90-meter-long tunnel. Determine the value of 'p'.
    A 10.25 Correct Answer Incorrect Answer
    B 20.05 Correct Answer Incorrect Answer
    C 12.5 Correct Answer Incorrect Answer
    D 18.22 Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let the speed of the train be 'u' meters per second. At 75% of the original speed, the speed becomes 0.74u The total distance to cross the tunnel = 150 + 90 = 240 meters. From Equation I and II, The value of 'p' is 12.5 seconds.

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