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Pipe A can fill a cistern in 4 hours and...

Pipe A can fill a cistern in 4 hours and another pipe B is installed. Both the pipes together fill the cistern in `2 1/2` hours. How long will it take for B alone to fill the cistern.
पाइप A किसी टंकी को 4 घंटे में भर सकती है | एक अन्य पाइप B लगाई गयी | दोनों पाइप एक साथ टंकी को `2 1/2` घंटे में भर सकती है | B को अकेले इस टंकी को भरने में कितना समय लगेगा ?

A

5 hours

B

`6 3/8` hours

C

`6 2/3` hours

D

`5 1/6` hours

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