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    Question

    A boatman rows 12 km in 15 minutes, along the stream and

    48 km in 3 hours against the stream. The speed of the stream is:
    A 30 km/hr Correct Answer Incorrect Answer
    B 15 km/hr Correct Answer Incorrect Answer
    C 16 km/hr Correct Answer Incorrect Answer
    D 8 km/hr Correct Answer Incorrect Answer
    E 24 km/hr Correct Answer Incorrect Answer

    Solution

    Rate downstream = 12/15 x 60 = 48 km/hr Rate upstream = 48/3 = 16 km/hr Speed of current = 1/2 (Rate downstream – Rate upstream) ⇒ 1/2 (48 – 16) km/hr = 16 km/hr

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