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    Question

    A boat takes half time in moving a certain distance

    downstream than upstream. What is the ratio between rate in still water and rate of current ?
    A 17 : 9 Correct Answer Incorrect Answer
    B 7: 19 Correct Answer Incorrect Answer
    C 3 : 1 Correct Answer Incorrect Answer
    D 37 : 19 Correct Answer Incorrect Answer

    Solution

    Let the speed of a boat in still water = ukmph And, speed of current = vkmph Rate downstream = (u+v) kmph Rate upstream =(u−v)kmph Let the distance covered in each case be x km. Then, (2x/u+v) = (x/u−v) 2(u−v) = u+v u = 3v (u/v) = 3:1 Therefore, Required ratio = 3:1

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