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    Question

    Two trains X and Y start at the same time in the

    opposite direction from two points P and Q and arrive at their destinations 100 and 81 hours respectively after their meeting each other. At what speed does the second train Y travel if the first train travels at 108 km/h. 
    A 75 km/h Correct Answer Incorrect Answer
    B 105 km/h Correct Answer Incorrect Answer
    C 96 km/h Correct Answer Incorrect Answer
    D 108 km/h Correct Answer Incorrect Answer
    E 120 km/h Correct Answer Incorrect Answer

    Solution

    Let the speed and time of two trains be s1 and s2, and t1 and t2. s1/s2 = (t2/t1)1/2 => 108/s2 = 9/10 => s2 = 120 km/hr.

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