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

    Question

    A man can row one quarters of a kilometer against the

    stream in 30/4 minutes and return in 5/2 minutes. The speed of the man in still water is:
    A 2.5 km/hr Correct Answer Incorrect Answer
    B 2 km/hr Correct Answer Incorrect Answer
    C 3 km/hr Correct Answer Incorrect Answer
    D 4 km/hr Correct Answer Incorrect Answer

    Solution

    Distance covered upstream in 30/4 minutes =  1/4  Km Distance covered upstream in 1 hour = 1/4×  4/30× 60 = 2 km/hr Distance covered downstream in  5/2 minutes = 1/4 km Distance covered downstream in 1 hour = 1/4  ×  2/5× 60 = 6 km/hr Speed of the man in still water = 1/2(2 + 6) = 4 km/hr

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