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     EduGorilla 
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    A large cistern can be filled by two pipes P and Q. How many minutes will it take to fill the Cistern from an empty state if Q is used for half the time and P and Q fill it together for the other half?

    Options :-

    1. 6.5 minutes

    2. 7.5 minutes

    3. 8.5 minutes

    4. 9.5 minutes

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