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    Question

    A boat goes 40 km in upstream in 5 hours and takes 3

    hours to complete a distance of 18 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) = 40/5 = 8 km/hr Downstream speed (D) = 18/3 = 6 km/hr Speed of boat in still water = (8 + 6)/2 = 14/2 = 7 km/hr

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