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    Question

    A boat running downstream covers a distance of 45 km in

    9 hrs and covering the same distance upstream in 15 hrs. What is the speed of a boat in still water?
    A 4 km/hr Correct Answer Incorrect Answer
    B 7 km/hr Correct Answer Incorrect Answer
    C 5 km/hr Correct Answer Incorrect Answer
    D 6 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed = 45/9 = 5 km/hr Upstream speed = 45/15 = 3 km/hr So speed of boat in still water = (5 + 3)/2 = 4 km/hr

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