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    Question

    A boat can cover 160 km in downstream in 16 hours and

    144 km in upstream in 18 hours. Find the speed of boat in still water
    A 5 km/hr Correct Answer Incorrect Answer
    B 8 km/hr Correct Answer Incorrect Answer
    C 9 km/hr Correct Answer Incorrect Answer
    D 10 km/hr Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 160/16 = 10 km/hr Upstream speed of the boat = 144/18 = 8 km/hr Speed of boat in still water = (10 + 8)/2 = 9 km/hr

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