Question

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

    upstream is 15: 13. If the boat can travel 340 km in downstream in 10 hours, then find the time taken by the boat to cover 50 km in still water.
    A 130 minutes Correct Answer Incorrect Answer
    B 100 minutes Correct Answer Incorrect Answer
    C 145 minutes Correct Answer Incorrect Answer
    D 118 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 lsquo;15xrsquo; km/h and lsquo;13xrsquo; km/h, respectively. Speed of stream = 15x ndash; 13x = 2x km/h Speed of boat in downstream = 15x + 2x = 17 km/h So, 17x = 340/10 =gt; x = 2 Speed of boat in still water = 15 times; 2 = 30 km/h Desired time = 50/30 x 60 = 100 minutes

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