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    Question

    A boat takes 3 hours to travel 30 km downstream and 5

    hours to travel the same distance upstream. What is the speed of the boat in still water?
    A 8 km/h Correct Answer Incorrect Answer
    B 4 km/h Correct Answer Incorrect Answer
    C 7 km/h Correct Answer Incorrect Answer
    D 2 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed = 30 / 3 = 10 km/h Upstream speed = 30 / 5 = 6 km/h Speed in still water = (10 + 6) / 2 = 8 km/h

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