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    Question

    Speed of a boat in still water to speed of boat in

    upstream is 9: 5. If the boat can travel 221 km in downstream in 5 hours, then find the time taken by the boat to cover 38.25 km in still water.
    A 39 minutes Correct Answer Incorrect Answer
    B 51 minutes Correct Answer Incorrect Answer
    C 20 minutes Correct Answer Incorrect Answer
    D 75 minutes Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let speed of boat in still water and speed of boat in upstream be ‘9x’ km/h and ‘5x’ km/h, respectively. Speed of stream = 9x – 5x = 4x km/h Speed of boat in downstream = 9x + 4x = 13x km/h So, 13x = 221/5 => x = 3.4 Speed of boat in still water = 9 × 3.4 = 30.6 km/h Desired time = 38.25/30.6 x 60 = 75 minutes

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