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    Question

    A boat can cover 180 km in downstream in 9 hours and 110

    km in upstream in 11 hours. Find the speed of boat in still water.
    A 10 km/hr Correct Answer Incorrect Answer
    B 15 km/hr Correct Answer Incorrect Answer
    C 11 km/hr Correct Answer Incorrect Answer
    D 13 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 180/9 = 20 km/hr Upstream speed of the boat = 110/11 = 10 km/hr Speed of boat in still water = (20 + 10)/2 = 15 km/hr

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