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    Question

    A man rows a boat 36 kms in 6 hours downstream and

    returns upstream in 12 hours. The speed of the stream (in km per hour) is:
    A 1.5 km/hr Correct Answer Incorrect Answer
    B 4.5 km/hr Correct Answer Incorrect Answer
    C 2 km/hr Correct Answer Incorrect Answer
    D 3 km/hr Correct Answer Incorrect Answer
    E 3.75 km/hr Correct Answer Incorrect Answer

    Solution

    Rate downstream = 36/6 = 6 km/hr Rate upstream = 36/12 = 3 km/hr Now, speed of the stream = (rate downstream – rate upstream)/2 ⇒ (6 – 3)/2 = 1.5 km/hr

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