a mixing tank is filled with 240 gallons of water in which 18 pounds of salt is dissolved. a saline solution flows into this tank at a rate of 3 gallons per minute, while the well mixed solution drains from the tank at the same rate of 3 gallons per minute. let be the amount of salt in pounds in this tank at time in minutes. the amount of salt in this tank can be modeled by the autonomous differential equation: what is the initial amount of salt (in pounds) in this tank? lbs how much salt is in this tank after a long time, ? lbs what is the equilibrium salt concentration (in pounds per gallon) of this tank? lbs/gal what is the rate of change in the amount of salt in this tank when it is at 35 pounds from the equilibrium solution? lbs/min
