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    Question

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

    upstream is 12: 11. If the boat can travel 260 km in downstream in 4 hours, then find the time taken by the boat to cover 40 km in still water.
    A 30 minutes Correct Answer Incorrect Answer
    B 40 minutes Correct Answer Incorrect Answer
    C 10 minutes Correct Answer Incorrect Answer
    D 18 minutes Correct Answer Incorrect Answer

    Solution

    Let speed of boat in still water and speed of boat in upstream be ‘12x’ km/h and ‘11x’ km/h, respectively. Speed of stream = 12x – 11x = x km/h Speed of boat in downstream = 12x + x = 13km/h So, 13x = 260/4 => x = 5 Speed of boat in still water = 12 × 5 = 60 km/h Desired time = 40/60 x 60 = 40 minutes

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