Mathematics · Pipes and Cisterns
एक पाइप एक टंकी को 6 घंटे में भर सकता है। दूसरा पाइप भरी हुई टंकी को 7 घंटे में खाली कर सकता है। यदि दोनों पाइपों को एक साथ खोल दिया जाए, तो टंकी के आधे भरने में लगने वाला समय (घंटों में) क्या है?
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