Question

A cistern has two inlet pipes, A and B, which can fill it in 12 hours and 18 hours, respectively. There is also a drain pipe, C, that can empty the full cistern in 36 hours. If all three pipes are opened together, then how long will it take to fill the cistern?

A 12 hours
B 9 hours
C 10 hours
D 6 hours
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