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    Question

    A boat goes 65 km in upstream in 5 hours and takes 4

    hours to complete a distance of 20 km in downstream. Find the speed of boat in still water.
    A 6.2 km/hr Correct Answer Incorrect Answer
    B 4 km/hr Correct Answer Incorrect Answer
    C 12 km/hr Correct Answer Incorrect Answer
    D 7 km/hr Correct Answer Incorrect Answer
    E 9 km/hr Correct Answer Incorrect Answer

    Solution

    Speed of boat in still water = (D + U)/2 Upstream speed (U) = 65/5 = 13 km/hr Downstream speed (D) = 20/4 = 5 km/hr Speed of boat in still water = (13 + 5)/2 = 18/2 = 9 km/hr

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