Two pipes A and B can fill a cistern in 24 minutes and 30 minutes respectively. Both are opened together, but at the end of 6 minutes the first is turned off. How much longer pipe B will take to fill the cistern?

Two pipes A and B can fill a cistern in 24 minutes and 30 minutes resp

1.	Two pipes A and B can fill a cistern in 24 minutes and 30 minutes respectively. Both are opened together, but at the end of 6 minutes the first is turned off. How much longer pipe B will take to fill the cistern?
A.	$$ {22{1 over 2}}{minute}$$
B.	21 minute
C.	24 minute
D.	25 minute
E.	$$ {23{1 over 2}}{minute}$$
Answer» B. 21 minute

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Two pipes A and B can fill a cistern in 24 minutes and 30 minutes respectively. Both are opened together, but at the end of 6 minutes the first is turned off. How much longer pipe B will take to fill the cistern?

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