New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

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

    stream is 13 kmph. A man rows to a place at a distance of 56 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
    E None of these Correct Answer Incorrect Answer

    Solution

    Rate upstream = 15 – 13 = 2 kmph Rate downstream = 15 + 13 = 28 kmph Time taken to go upstream = 56/2 = 28 hr Time taken to go downstream = 56/28 = 2 hr Total time = 28 + 2 = 30 hrs

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