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    Question

    A boat goes 220 km downstream in 11 hours, and 135 km

    upstream in 15 hours. The speed of the stream is  
    A 8.5 km/hr Correct Answer Incorrect Answer
    B 5.5 km/hr Correct Answer Incorrect Answer
    C 7.5 km/hr Correct Answer Incorrect Answer
    D 6.5 km/hr Correct Answer Incorrect Answer

    Solution

    Distance downstream= 220 km Time taken to row downstream = 11 hrs. therefore, speed downstream = 220/11 = 20 km/hr Distance upstream = 135 km Time taken to row upstream = 15 hrs therefore, speed upstream = 135/15 = 9 km/hr therefore, speed of the stream = 1/2 (20 - 9) = 5.5 km/hr

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