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    Question

    A boat travels downstream at a speed of 25 km/h and the

    stream's current adds an additional 3 km/h to its speed. How long will it take for the boat to travel 50 km downstream and then return 57 km upstream?
    A 6 hours Correct Answer Incorrect Answer
    B 3 hours Correct Answer Incorrect Answer
    C 4 hours Correct Answer Incorrect Answer
    D 5 hours Correct Answer Incorrect Answer

    Solution

    Upstream speed of the boat = (25 - 6) = 19 km/h [Upstream speed = Downstream speed - 2 X speed of the stream] Total time taken by the boat to cover the required distance = (50/25) + (57/19) = 2 + 3 = 5 hours

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