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    Question

    Speed of a boat in still water is 15 kmph and speed of

    stream is 12 kmph. A man rows to a place at a distance of 81 km and come back to starting point. The total time taken by him is:
    A 10 hrs Correct Answer Incorrect Answer
    B 20 hrs Correct Answer Incorrect Answer
    C 40 hrs Correct Answer Incorrect Answer
    D 30 hrs Correct Answer Incorrect Answer

    Solution

    Rate upstream = 15 тАУ 12 = 3 kmph Rate downstream = 15 + 12 = 27 kmph Time taken to go upstream = 81/3 = 27 hr Time taken to go downstream = 81/27 = 3 hr Total time = 27 + 3 = 30 hrs

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