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     EduGorilla 
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    A cistern is normally filled in 15 hours but takes three hours longer to fill because of a leak in its bottom. If the cistern is full, then in how many hours will the leak empty the cistern?

    Options :-

    1. 24 hours

    2. 33 hours

    3. 58 hours

    4. 72 hours

    5. 90 hours

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