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    Question

    The ratio of the speed of a motorboat to that of a

    current of water is 36:5. The boat goes along with the current in 5 hours and 10 minutes it will come back in. type-ssc
    A 41/6hours Correct Answer Incorrect Answer
    B 31/4hours Correct Answer Incorrect Answer
    C 17/3hours Correct Answer Incorrect Answer
    D 24/5hours Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water =B and speed of stream =S B:S =36:5 Speed of motorboat in downstream =B+S=41km/h Speed of motorboat in upstream =B-S=31km/h Distance= downstream speed × downstream time =41×31/6 Upstream time =Distance / upstream speed = (41×31/6)/31 =41/6 hours.

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