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     EduGorilla 
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    Pipes A and B can fill a tank in 15 hours and 20 hours, respectively. How long will it take to fill the tank if both the pipes are used together?

    Options :-

    1. 121/2 hours
    2. 171/2 hours
    3. 84/7 hours
    4. 154/7 hours
    5. None of these
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