.3 \& 9.4 Separable Equations and Applications 8. A tank contains 10 gallons of water and 4 pounds of the chemical Dornite. To decrease the concentration of Dornite, a solution that contains 0.05 pounds per gallon is added to the tank at the rate of 2 gallons per minute. Assume the instantly well mixed solution is drained from the tank at the same rate. a) Find the amount of chemical in the tank at time t. b) How much chemical is present after 10 minutes? c) How long does it take for the concentration of Dornite to be reduced to 0.1 pounds per gallon