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     EduGorilla 
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    A tank can be filled by taps X and Y in 5 hrs and 10 hrs, respectively, while another tap Z empties the tank in 20 hrs. In how many hours can the tank be filled if all the 3 taps are kept open?

    Options :-

    1. 5
    2. 4
    3. 7
    4. 8
    5. #
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