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    Question

    A boat can travel 18 km downstream in 2 hours and 12 km

    upstream in 3 hours. What is the speed of the boat in still water?
    A 6.5 km/hr Correct Answer Incorrect Answer
    B 5.5 km/hr Correct Answer Incorrect Answer
    C 5 km/hr Correct Answer Incorrect Answer
    D 4.5 km/hr Correct Answer Incorrect Answer
    E 4 km/hr Correct Answer Incorrect Answer

    Solution

    Speed downstream = Distance/Time = 18/2 = 9 km/hr Speed upstream = Distance/Time = 12/3 = 4 km/hr Speed of boat in still water = (Downstream speed + Upstream speed) / 2 = (9 + 4) / 2 = 13/2 = 6.5 km/hr Correct Option: a) 6.5 km/hr

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