Mathematics · Pipes and Cisterns

एक पाइप एक टैंक को 7 घंटे में भर सकता है। दूसरा पाइप भरे हुए टैंक को 9 घंटे में खाली कर सकता है। यदि दोनों पाइपों को एक साथ खोल दिया जाता है, तो टैंक कितने समय (घंटों में) में दो-तिहाई भर जाएगा?

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