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    Question

    A boat can travel 15 km upstream and 21 km downstream in

    3 hours. Find the speed of the boat in still water if the speed of the stream is 1.5 km/h.
    A 12.5 km/h Correct Answer Incorrect Answer
    B 14.9 km/hr Correct Answer Incorrect Answer
    C 18.8 km/hr Correct Answer Incorrect Answer
    D 15.5 km/hr Correct Answer Incorrect Answer

    Solution

    Let the speed of the boat in still water be ‘x’ km/h. Upstream speed = ‘x – 1.5’ km/h Downstream speed = ‘x + 1.5’ km/h According to the question: Thus, the speed of the boat in still water is  12.5 km/h .

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