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Pipe A can fill an empty tank completely...

Pipe A can fill an empty tank completely in 11 hours. Pipe B can empty this fully filled tank in 15 hours. If both the pipes are opened simultaneously, in what time will the empty tank be filled?
पाइप A किसी खाली टैंक को 11 घंटे में पूर्ण रूप से भर सकता है | पाइप B इस पूर्ण रूप से भरे गए टैंक को 15 घंटे में खाली कर सकता है | यदि दोनों पाइपों को एक साथ खोला जाता है, तो खाली टैंक कितने समय में भरेगा?

A

49 hours and 45 minutes / 49 घंटे 45 मिनट

B

47 hours and 30 minutes / 47 घंटे 30 मिनट

C

41 hours and 15 minutes / 41 घंटे 15 मिनट

D

39 hours and 15 minutes / 39 घंटे 15 मिनट

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