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    Question

    Speed of a boat in still water is 9 kmph and speed of

    stream is 6 kmph. A man rows to a place at a distance of 30 km and come back to starting point. The total time taken by him is:
    A 16 hrs Correct Answer Incorrect Answer
    B 14 hrs Correct Answer Incorrect Answer
    C 12 hrs Correct Answer Incorrect Answer
    D 10 hrs Correct Answer Incorrect Answer

    Solution

    Rate upstream = 9 – 6 = 3 kmph Rate downstream = 9 + 6 = 15 kmph Time taken to go upstream = 30/3 = 10 hr Time taken to go downstream = 30/15 = 2 hr Total time = 10 + 2 = 12 hrs

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