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    Question

    A man can row 4.5 km/h in still

    water but takes twice as long to row up a stream as down it. What is the rate of the stream in km/h?
    A 1.5 Correct Answer Incorrect Answer
    B 2.25 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D none of these Correct Answer Incorrect Answer

    Solution

    Uprate + downrate = 2 × 4`1/2` =9 km/h. Since downrate = 2x uprate is 9 km. uprate = 3km/h Speed of the current `4 1/2-3 = 1 1/2` km/h.

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