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    Question

    The speed of the current is 80% lower than the boat's

    speed in still water. The boat covers 120 km in still water in 8 hours. How long will it take for the boat to travel 96 km upstream?
    A 8 hours Correct Answer Incorrect Answer
    B 9.6 hours Correct Answer Incorrect Answer
    C 7.2 hours Correct Answer Incorrect Answer
    D 12 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of the boat in still water = 120 ÷ 8 = 15 km/h Speed of current = 15 X 0.2 = 3 km/h Therefore, upstream speed of the boat = 15 - 3 = 12 km/hr Required time taken = 96 ÷ 12 = 8 hours

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