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    Question

    A Man Rows upstream 48 km and downstream 72 kilometers

    taking 6 hours each time the speed of the current is.
    A 2km/h Correct Answer Incorrect Answer
    B 8km/h Correct Answer Incorrect Answer
    C 12km/h Correct Answer Incorrect Answer
    D 6km/h Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water =B and speed of stream =S Speed in downstream (B+S) =72/6=12km/h Speed in upstream =B-S =48/6=8km/h B+S=12           … (1) B-S=8  … (2) After solving Eq (1) and (2) B =10km/h S=2km/h Speed of stream =2km/h

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