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Tap A can fill a tank in 6 hours and tap...

Tap A can fill a tank in 6 hours and tap B can empty the same tank in 10 hours. If both taps are opened together, then how much time (in hours) will be taken to fill the tank?
नल A, 6 घंटे में एक टैंक भर सकता है और नल B,10 घंटे में उसी टैंक को खाली कर सकता है। यदि दोनों नल एक साथ खोले जाते हैं, तो टैंक को भरने में कितना समय (घंटों में) लगेगा?

A

15

B

18

C

20

D

16

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