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    Question

    If Boat goes 80 km upstream in 4 hours and 60 km

    downstream in 2 hours, then the speed of the boat in still water is
    A 10 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 25 Correct Answer Incorrect Answer
    D 15 Correct Answer Incorrect Answer
    E 20 Correct Answer Incorrect Answer

    Solution

    Let the speed of boat = x and the speed of the stream = y 80/(x - y) = 4 => x - y = 20 60/(x + y) = 2 => x + y = 30 From above x = 25 km/hr

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