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    Question

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

    upstream is 8: 7. If the boat can travel 450 km in downstream in 10 hours, then find the time taken by the boat to cover 34 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 30 minutes Correct Answer Incorrect Answer

    Solution

    Let speed of boat in still water and speed of boat in upstream be ‘8x’ km/h and ‘7x’ km/h, respectively. Speed of stream = 8x – 7x = x km/h Speed of boat in downstream = 8x + x = 9x km/h So, 9x = 450/10 => x = 5 Speed of boat in still water = 8 × 5 = 40 km/h Desired time = 34/40 x 60 = 51 minutes

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