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     EduGorilla 
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    Two pipes P and Q can fill a tub in 20 minutes and 30 minutes, respectively. If both the pipes are opened simultaneously, then after how many minutes should pipe P be turned off, so that the tub is filled in exactly 15 minutes?

    Options :-

    1. 10
    2. 15
    3. 20
    4. 14
    5. 18
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