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    Question

    A boat can cover 170 km in downstream in 5 hours and 100

    km in upstream in 10 hours. Find the speed of boat in still water.
    A 22 km/hr Correct Answer Incorrect Answer
    B 9 km/hr Correct Answer Incorrect Answer
    C 7 km/hr Correct Answer Incorrect Answer
    D 8 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 170/5 = 34 km/hr Upstream speed of the boat = 100/10 = 10 km/hr Speed of boat in still water = (34 + 10)/2 = 22 km/hr

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