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    Question

    A man rows upstream 10 km and downstream 15 km

    taking 5 hours each. Find the man’s speed in still water.
    A 7.5 km/hr Correct Answer Incorrect Answer
    B 4 km/hr Correct Answer Incorrect Answer
    C 10 km/hr Correct Answer Incorrect Answer
    D 2.5 km/hr Correct Answer Incorrect Answer

    Solution

    Distance upstream = 10 km, time taken to row upstream = 5 hrs. Speed upstream = 10/5 = 2 km/hr. Distance downstream= 15 km, Time taken to row downstream = 5 hrs. Speed downstream = 15/5 = 3 km/hr. Man’s rate in still water = (3 + 2) * ½ = 2.5 kmph

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