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    Question

    A man rows upstream 10 km and downstream 15 km

    taking 5 hours each. Find the speed of current.
    A 0.5 km/hr Correct Answer Incorrect Answer
    B 1 km/hr Correct Answer Incorrect Answer
    C 1.5 km/hr Correct Answer Incorrect Answer
    D 2.5 km/hr Correct Answer Incorrect Answer
    E None of these 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. Speed of the current =(3 – 2) x ½ = 0.5 km / hr

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