Question

    A swimmer, whose speed in 15 km/h in still water goes 30

    km downstream and comes back. He takes 4 hours 30 minutes for the whole journey. What is the speed of the stream, in km/h?
    A 3 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 6 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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