Two pipes can fill a tank in 12 hours and 16 hours respectively. A third pipe can empty the tank in 30 hours. If all three pipes are opened and functions simultaneously, how much time will the tank take to be full?( in hours )

Two pipes can fill a tank in 12 hours and 16 hours respectively. A thi

1.	Two pipes can fill a tank in 12 hours and 16 hours respectively. A third pipe can empty the tank in 30 hours. If all three pipes are opened and functions simultaneously, how much time will the tank take to be full?( in hours )
A.	$10\frac{4}{9}$$
B.	$9\frac{1}{2}$$
C.	$8\frac{8}{9}$$
D.	$7\frac{2}{9}$$
Answer» D. $7\frac{2}{9}$$

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Two pipes can fill a tank in 12 hours and 16 hours respectively. A third pipe can empty the tank in 30 hours. If all three pipes are opened and functions simultaneously, how much time will the tank take to be full?( in hours )

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