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    Question

    Train X running at a speed of 30 km/hr crosses train Y

    in 15 seconds. Find the speed of train Y (in km/hr), if the sum of the length of train X and Y is 500 meters and both trains running in the opposite direction.
    A 90 km/hr Correct Answer Incorrect Answer
    B 85 km/hr Correct Answer Incorrect Answer
    C 73 km/hr Correct Answer Incorrect Answer
    D 65 km/hr Correct Answer Incorrect Answer

    Solution

    Let speed of train Y be 'a' km/hr. According to question, => 15(30 + a) × (5/18) = 500 => 450 + 15a = 1800 => 15a = 1350 => a = 90 km/hr

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