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    Question

    A launch goes 120 km with the current in 6 hours. For the

    same trip against the current, it needs 4 hours more. What’s the speed of the boat in still water?
    A 10 km/hr Correct Answer Incorrect Answer
    B 26 km/hr Correct Answer Incorrect Answer
    C 16 km/hr Correct Answer Incorrect Answer
    D 23 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Downstream speed = 120 / 6 = 20

    Upstream speed = 120 / 10 = 12

    V + U = 20

    V – U = 12

    By solving, we get V = (20 + 12) / 2 = 16 km/hr

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