Mathematics · Pipes and Cisterns
एक नल किसी टैंक को 27 घंटे में भर सकता है और दूसरा नल इसे 36 घंटे में खाली कर सकता है। यदि दोनों नलों को एक साथ चलाया जाता है, तो टैंक के 49 भाग को भरने में कितना समय (घंटों में) लगेगा?
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