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    Question

    A boat can travel at a speed of 15 km/h in still water. If the speed of the current is 3 km/h, how long will it take to travel 24 km upstream?

    A 1.5 hours Correct Answer Incorrect Answer
    B 2 hours Correct Answer Incorrect Answer
    C 2.5 hours Correct Answer Incorrect Answer
    D 3 hours Correct Answer Incorrect Answer

    Solution

    Effective speed upstream = Speed in still water - Speed of current = 15 - 3 = 12 km/h. Time = Distance / Speed = 24 / 12 = 2 hours. Answer: b) 2 hours.

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