1.

Pipe A can fill a tank in 4 hours and pipe B can fill the same tank in 3 hours. Pipe C can empty the same full tank in 2 hours. If all the pipes are opened together, then what portion of the tank will be filled after 6 hours?

A. 2/9
B. 1/2
C. 1/3
D. 2/3
Answer» C. 1/3


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