A process consists of three perfectly stirred tanks in series. The volume in each tank is 30 L, and the volumetric flow rate through the system is 5 L/min. At some particular time, the inlet concentration of the non reacting species is changed from 0.6 to 0.45 (mass fraction) and held there. Use the species mole balance equation to derive the transfer function relating the concentration leaving the third tank C3 to the inlet concentration C0(Hint: assume no reaction) and determine exit concentrations from all tanks at t = 20 min.