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    Question

    A boat goes 40km upstream in 8 hours and 36km downstream

    in 6 hours. The speed of the boat in still water.
    A 5.5km/h Correct Answer Incorrect Answer
    B 4.6km/h Correct Answer Incorrect Answer
    C 11km/h Correct Answer Incorrect Answer
    D 9.2km/h Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water =B and speed of stream =S Speed of boat in downstream B+S=36/6=6km/h Speed of boat in upstream =B-S=40/8=5km/h Now Speed of boat in still water B= (6+5)/2 =11/2=5.5km/h

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