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     EduGorilla 
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    A girl travels three-fifths of a distance PQ at a speed of 3x, and the remaining at a speed of 2y. If she goes back at a speed of 5z in the same time, then

    Options :-

    1. 1/x + 1/y = 1/z
    2. x + y = z
    3. 1/x + 1/y = 2/z
    4. 1/x-1/y=1/z
    5. None of these
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