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     EduGorilla 
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    Water purifiers Y and Z can fill a water cooler in 60 minutes and 75 minutes, respectively. If the tap of the water cooler is left open, then it will take 50 minutes to fill it. How much time will it take for the tap of the water cooler to empty it?

    Options :-

    1. 45 minutes
    2. 67 minutes
    3. 75 minutes
    4. 100 minutes
    5. 109 minutes
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