A tank contains 60 kg of salt and 2000 L of water. Water containing 0.4kgL of salt enters the tank at the rate 8 Lmin . The solution is mixed and drains from the tank at the rate 2 Lmin . A(t) is the amount of salt in the tank at time t measured in kilograms. (a) A(0) = 60 equation editorEquation Editor (kg) (b) A differential equation for the amount of salt in the tank is A'+2/(2000+6t)-3.2 equation editorEquation Editor =0 . (Use t,A, A', A'', for your variables, not A(t), and move everything to the left hand side.)