One pipe can fill an empty cistern in 4 hours while another can drain the cistern when full in 10 hours. Both the pipes were turned on when the cistern was half-empty. How long will it take for the cistern to be full?

One pipe can fill an empty cistern in 4 hours while another can drain

1.	One pipe can fill an empty cistern in 4 hours while another can drain the cistern when full in 10 hours. Both the pipes were turned on when the cistern was half-empty. How long will it take for the cistern to be full?
A.	3 hours 20 minutes
B.	6 hours 40 minutes
C.	4 hours 20 minutes
D.	5 hours 30 minutes
Answer» B. 6 hours 40 minutes

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One pipe can fill an empty cistern in 4 hours while another can drain the cistern when full in 10 hours. Both the pipes were turned on when the cistern was half-empty. How long will it take for the cistern to be full?

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