Pipe A can fill a cistern in 4 hours and another pipe B is installed. Both the pipes together fill the cistern in \(2\frac{1}{2}\) hours. How long will it take for B alone to fill the cistern?

Pipe A can fill a cistern in 4 hours and another pipe B is installed.

1.	Pipe A can fill a cistern in 4 hours and another pipe B is installed. Both the pipes together fill the cistern in \(2\frac{1}{2}\) hours. How long will it take for B alone to fill the cistern?
A.	\(6\frac{2}{3}hours\)
B.	5 hours
C.	\(5\frac{1}{6}hours\)
D.	\(6\frac{3}{8}\;hours\)
Answer» B. 5 hours

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Pipe A can fill a cistern in 4 hours and another pipe B is installed. Both the pipes together fill the cistern in \(2\frac{1}{2}\) hours. How long will it take for B alone to fill the cistern?

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