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    Question

    To go 75 km downstream, a boat takes 5 hours. For the

    same 75 km upstream, it takes 10 hours more than that. What is the boat’s still-water speed?
    A 10 km/hr Correct Answer Incorrect Answer
    B 26 km/hr Correct Answer Incorrect Answer
    C 15 km/hr Correct Answer Incorrect Answer
    D 23 km/hr Correct Answer Incorrect Answer

    Solution

    ATQ,

    Downstream speed = 75 / 5 = 15

    Upstream speed = 75 / 15 = 5

    V + U = 15

    V – U = 5

    By solving, we get V = (15 + 5) / 2 = 10 km/hr

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