One pipe can fill an empty cistern in 7/4 hours while another can drain the cistern when full in 21/8 hours. Both the pipes were turned on when the cistern was two-thirds empty. How long will it take for the cistern to be full?

One pipe can fill an empty cistern in 7/4 hours while another can drai

1.	One pipe can fill an empty cistern in 7/4 hours while another can drain the cistern when full in 21/8 hours. Both the pipes were turned on when the cistern was two-thirds empty. How long will it take for the cistern to be full?
A.	3 hours 45 minutes
B.	3 hours 20 minutes
C.	3 hours 30 minutes
D.	3 hours 15 minutes
Answer» D. 3 hours 15 minutes

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One pipe can fill an empty cistern in 7/4 hours while another can drain the cistern when full in 21/8 hours. Both the pipes were turned on when the cistern was two-thirds empty. How long will it take for the cistern to be full?

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