A cistern has 3 pipes A, B and C, A and B can fill it in 2 and 3 hours respectively. C is a waste pipe. If all the 3 pipes be opened at once, 7/24 of the cistern will be filled up in 30 minutes. In what time can C empty the full cistern ?

A cistern has 3 pipes A, B and C, A and B can fill it in 2 and 3 hours

1.	A cistern has 3 pipes A, B and C, A and B can fill it in 2 and 3 hours respectively. C is a waste pipe. If all the 3 pipes be opened at once, 7/24 of the cistern will be filled up in 30 minutes. In what time can C empty the full cistern ?
A.	3 hours
B.	4 hours
C.	5 hours
D.	6 hours
Answer» C. 5 hours

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