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    Question

    Train A running at a speed of 45 km/hr crosses train B

    in 30 seconds. Find the speed of train B (in km/hr), if the sum of the length of train A and B is 550 meters and both trains running in the opposite direction.
    A 31 km/hr Correct Answer Incorrect Answer
    B 36 km/hr Correct Answer Incorrect Answer
    C 21 km/hr Correct Answer Incorrect Answer
    D 24 km/hr Correct Answer Incorrect Answer
    E 33 km/hr Correct Answer Incorrect Answer

    Solution

    Let speed of train B be ‘x’ km/hr. According to question, => 30(45 + x) × (5/18) = 550 => 1350 + 30x = 1980 => 30x = 630 => x = 21 km/hr

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