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    3. Quantitative Aptitude
    4. Boats and streams
    5. A boat can cover 150 km in downstream in 5 hours and 121 km in upstream in 11 hours. Find the speed

    Question

    A boat can cover 150 km in downstream in 5 hours and 121

    km in upstream in 11 hours. Find the speed of boat in still water.
    A 21.5 km/hr Correct Answer Incorrect Answer
    B 18.5 km/hr Correct Answer Incorrect Answer
    C 20.5 km/hr Correct Answer Incorrect Answer
    D 19.5 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 150/5 = 30 km/hr Upstream speed of the boat = 121/11 = 11 km/hr Speed of boat in still water = (11 + 30)/2 = 20.5 km/hr

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