Mathematics · Time and Work
पाइप X एक टैंक को 60 घंटे में भर सकता है जबकि पाइप Y उसी टैंक को 72 घंटे में भर सकता है। दोनों पाइपों को एक साथ 20 घंटे के लिए खोला जाता है। टैंक का कितना भाग खाली रह जाता है?
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