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    Question

    The speed of a boat in still water is 10 km/hr. It

    covers (upstream) a distance of 36 km in 5 hours. The speed (in km/hr) of the stream is
    A 3.25 km/hr Correct Answer Incorrect Answer
    B 4.75 km/hr Correct Answer Incorrect Answer
    C 2.8 km/hr Correct Answer Incorrect Answer
    D 3 km/hr Correct Answer Incorrect Answer
    E 2.75 km/hr Correct Answer Incorrect Answer

    Solution

    Upstream speed of boat = Distance/Time = 36/5 = 7.2 km/hr Therefore, speed of current = 10 – 7.2 = 2.8 km/hr

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