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    Question

    A boat goes 450 km downstream in 25 hours, and 200 km

    upstream in 20 hours. The speed of the stream is┬а┬а
    A 8 km/hr Correct Answer Incorrect Answer
    B 2 km/hr Correct Answer Incorrect Answer
    C 5 km/hr Correct Answer Incorrect Answer
    D 4 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Distance downstream= 450 km Time taken to row downstream = 25 hrs. therefore, speed downstream = 450/25 = 18 km/hr Distance upstream = 200 km Time taken to row upstream = 20 hrs therefore, speed upstream = 200/20 = 10 km/hr therefore, speed of the stream = 1/2 (18 - 10) = 4 km/hr

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