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    Question

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

    upstream is 7: 6. If the boat can travel 440 km in downstream in 5 hours, then find the time taken by the boat to cover 38.5 km in still water.
    A 39 minutes Correct Answer Incorrect Answer
    B 45 minutes Correct Answer Incorrect Answer
    C 20 minutes Correct Answer Incorrect Answer
    D 30 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 ‘7x’ km/h and ‘6x’ km/h, respectively. Speed of stream = 7x – 6x = x km/h Speed of boat in downstream = 7x + x = 8x km/h So, 8x = 440/5 => x = 11 Speed of boat in still water = 7 × 11 = 77 km/h Desired time = 38.5/77 x 60 = 30 minutes

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