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    Question

    A boat covers a distance of 72 km downstream in 6 hours,

    while it takes 12 hours to cover the same distance upstream. What is the speed of the boat in still water?
    A 6 km/h Correct Answer Incorrect Answer
    B 9 km/h Correct Answer Incorrect Answer
    C 10 km/h Correct Answer Incorrect Answer
    D 8 km/h Correct Answer Incorrect Answer

    Solution

    ATQ, Speed of boat in upstream = 72/6 = 12 kmph Speed of boat in downstream = 72/12 = 6 kmph ∴ Speed of boat in still water = (12 + 6)/2 = 18/2 = 9 kmph 

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