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    Question

    The speed of a boat in still water is 6.5 times the

    speed of the stream. If the difference between the upstream and downstream speed of the boats is 24 km/hr, then find the time taken by the boat to travel 330 km in upstream.
    A 5 hours Correct Answer Incorrect Answer
    B 4 hours Correct Answer Incorrect Answer
    C 3 hours Correct Answer Incorrect Answer
    D 6 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the speed of the stream be ‘x’ km/hr Therefore, speed of the boat in still water = 6.5x km/hr Upstream speed of the boat = 6.5x – x = 5.5x km/hr Downstream speed of the boat = x + 6.5x = 7.5x km/hr According to the question, 7.5x – 5.5x = 24 => 2x = 24 => x = 12 Therefore, upstream speed of the boat = 5.5x = 66 km/hr Required time taken = 330/66 = 5 hours

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