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    3. Quantitative Aptitude
    4. Boats and streams
    5. The speed of a boat in still water is 12 km/hr. It covers (upstream) a distance of 30 km in 4 hours.

    Question

    The speed of a boat in still water is 12 km/hr. It

    covers (upstream) a distance of 30 km in 4 hours. The speed (in km/hr) of the stream is
    A 4.5 km/hr Correct Answer Incorrect Answer
    B 2.2 km/hr Correct Answer Incorrect Answer
    C 2 km/hr Correct Answer Incorrect Answer
    D 2.75 km/hr Correct Answer Incorrect Answer
    E 5.75 km/hr Correct Answer Incorrect Answer

    Solution

    Upstream speed of boat = Distance/Time = 30/4 = 7.5 km/hr Therefore, speed of current = 12 – 7.5 = 4.5 km/hr

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