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    Question

    A boat can travel 72 km upstream

    and 108 km downstream in 5 hours. Find the speed of the boat in still water if the ratio of the speed of the boat in upstream to the speed of the boat in downstream is 2:3 respectively.
    A 36 km/h Correct Answer Incorrect Answer
    B 56 km/h Correct Answer Incorrect Answer
    C 26 km/h Correct Answer Incorrect Answer
    D 16 km/h Correct Answer Incorrect Answer

    Solution

    Let the speed of the boat in upstream be ‘2x’ km/h and in downstream be ‘3x’ km/h, respectively. According to the question:

    Speed of the boat in still water = (2x+3x)/2 = (5×14.4)/2 = 36 km/h.

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