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    Question

    A boat goes 200 km downstream in 50 hours, and 90 km

    upstream in 30 hours. Find the speed of the boat in still water is
    A 3.2 km/hr Correct Answer Incorrect Answer
    B 3.5 km/hr Correct Answer Incorrect Answer
    C 7.5 km/hr Correct Answer Incorrect Answer
    D 4.5 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Distance downstream= 200 km Time taken to row downstream = 50 hrs. therefore, speed downstream = 200/50 = 4 km/hr Distance upstream = 90 km Time taken to row upstream = 30 hrs therefore, speed upstream = 90/30 = 3 km/hr therefore, speed of the boat in still water= 1/2 (4 + 3) = 3.5 km/hr

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