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     EduGorilla 
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    Two pipes can fill a cistern in 20 minutes and 10 minutes, respectively. Third pipe can empty it in 25 minutes. Given that 1/5th of the cistern is already full, in how much time will the cistern be full if all three pipes are opened together?

    Options :-

    1. 100/11 minutes
    2. 90/11 minutes
    3. 80/11 minutes
    4. 70/11 minutes
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