A tank contains 90 kg of salt and 2000 L of water: Pure waterenters a tank at the rate 8 L/min. The solution is mixed and drainsfrom the tank at the rate 4 L/min. What is the amount of salt inthe tank initially? Find the amount f salt in the tank after 4.5hours. Find the concentration of salt in the solution in the tankas the time approaches infinity. (Assume your tank is large enoughto hold the solution.)
