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    Question

    A boat can cover 120 km in upstream in 4 hours and 144

    km in downstream in 3 hours. Find the speed of the stream.
    A 12 km/hr Correct Answer Incorrect Answer
    B 13 km/hr Correct Answer Incorrect Answer
    C 9 km/hr Correct Answer Incorrect Answer
    D 8 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed = 144/4 = 48 km/hr Upstream speed = 120/4 = 30 km/hr Speed of stream = (48 – 30)/2 = 9 km/hr

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