Mathematics · Time and Work
दो नल एक टंकी को क्रमशः 3 घंटे और 24 घंटे में भर सकते हैं। एक तीसरा नल इसे 4 घंटे में खाली कर सकता है। यदि उन सभी को एक साथ खोल दिया जाए, तो खाली टंकी का एक-चौथाई भाग भरने में कितना समय (घंटों में) लगेगा?
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