Mathematics · Time and Work
दो नल एक टैंक को क्रमशः 11 घंटे और 14 घंटे में भर सकते हैं। एक तीसरा नल इसे 19 घंटे में खाली कर सकता है। यदि सभी नल एक साथ खोल दिए जाएं, तो खाली टैंक को भरने में कितना समय लगेगा?
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Mathematics · Time and Work
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