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    Question

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

    upstream is 4:3. If the boat can travel 440 km in downstream in 11 hours, then find the time taken by the boat to cover 40 km in still water.
    A 39 minutes Correct Answer Incorrect Answer
    B 45 minutes Correct Answer Incorrect Answer
    C 75 minutes Correct Answer Incorrect Answer
    D 48 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 ‘4x’ km/h and ‘3x’ km/h, respectively. Speed of stream = 4x – 3x = x km/h Speed of boat in downstream = 4x + x = 5x km/h So, 5x = 440/11 => x = 8 Speed of boat in still water = 4 × 8 = 32 km/h Desired time = 40/32 x 60 = 75 minutes

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