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    Question

    A boat can cover 143 km in downstream in 11 hours and

    120 km in upstream in 12 hours. Find the speed of boat in still water
    A 10.5 km/hr Correct Answer Incorrect Answer
    B 13.5 km/hr Correct Answer Incorrect Answer
    C 11.5 km/hr Correct Answer Incorrect Answer
    D 15.5 km/hr Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 143/11 = 13 km/hr Upstream speed of the boat = 120/12 = 10 km/hr Speed of boat in still water = (13 + 10)/2 = 11.5 km/hr

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