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    Question

    A boat takes 6 hours to cover 108 km in downstream. The

    ratio of the speed of the boat in still water to the speed of the stream is 8:1. Find the speed of the boat while going upstream.
    A 12 km/h Correct Answer Incorrect Answer
    B 18 km/h Correct Answer Incorrect Answer
    C 10 km/h Correct Answer Incorrect Answer
    D 14 km/h Correct Answer Incorrect Answer

    Solution

    ATQ, Speed of boat in downstream = 108 ├╖ 6 = 18 km/h
    Let speed of boat in still water and speed of stream be 8x km/h and x km/h
    Ratio of downstream to upstream = (8x + x)/(8x тАУ x) = 9x/7x = 9:7
    Therefore, speed upstream = (18 ├Ч 7)/9 = 14 km/h

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