Two pipes A and B can separately fill a tank in 16 and 18 minutes respectively. A third pipe C can drain off 45 liters of water per minute. If all the pipes are opened, the tank can be filled in 18 minutes. What is the capacity of the tank?	Choose the correct choice from the following options:  A) 590 liters  B) 720 liters  C) 740 liters  D) 860 liters  E) 620 liters
1/16 + 1/18 - 1/x   = 1/18   x = 16   16 * 45= 
<gadget id="calculator">16 * 45</gadget>
<output>720</output>
720   Answer:720 liters
<result>B</result>
Two pipes A and B can separately fill a tank in 16 and 18 minutes respectively. A third pipe C can drain off 45 liters of water per minute. If all the pipes are opened, the tank can be filled in 18 minutes. What is the capacity of the tank?