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    Question

    A man rows a boat 24 kms in 3 hours downstream and

    returns upstream in 6 hours. The speed of the stream (in km per hour) is:
    A 3 km/hr Correct Answer Incorrect Answer
    B 2 km/hr Correct Answer Incorrect Answer
    C 1.5 km/hr Correct Answer Incorrect Answer
    D 4.5 km/hr Correct Answer Incorrect Answer
    E 6 km/hr Correct Answer Incorrect Answer

    Solution

    Rate downstream = 24/3 = 8 km/hr Rate upstream = 24/6 = 4 km/hr Now, speed of the stream = (rate downstream – rate upstream)/2 ⇒ (8 – 4)/2 = 2 km/hr

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