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    Question

    A boat goes 24 km downstream in 2 hours and comes back

    the same distance upstream in 3 hours. Find the speed of the boat in still water.
    A 12 km/h Correct Answer Incorrect Answer
    B 10 km/h Correct Answer Incorrect Answer
    C 15 km/h Correct Answer Incorrect Answer
    D 13 km/h Correct Answer Incorrect Answer

    Solution

    Downstream speed = 24 / 2 = 12 km/h Upstream speed = 24 / 3 = 8 km/h Let boat speed in still water = b, stream speed = s. b + s = 12 b โˆ’ s = 8 Add: 2b = 20 โ†’ b = 10 km/h Then 10 + s = 12 โ†’ s = 2 km/h Answer: Boat speed = 10 km/h

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