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    Question

    A man takes a total time of 5 hours to cover 36 km

    downstream and 18 km upstream, while the man takes the same time to cover 54 km downstream and 12 km upstream. Find the speed of boat downstream.
    A 24 km/hr Correct Answer Incorrect Answer
    B 12 km/hr Correct Answer Incorrect Answer
    C 15 km/hr Correct Answer Incorrect Answer
    D 18 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the downstream speed and upstream speed be x km/hr and y km/hr, respectively. According to question, 36/x + 18/y = 5 -----(1) 54/x + 12/y = 5 -----(2) Solving (1) and (2), we get x = 18 km/hr and y = 6 km/hr So, downstream speed = 18 km/hr

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