The two$-$tank heating process shown in Fig. i consists of two identical tanks in series. At steady state, Ta To The temperature of each stream. entering the tank! and tank$2$ changes according to a step function to $10$ F and $20$F respectively. These changes occur simultaneously. PI controller on inlet stream of tank $2($K$,10$ and $30$ s$.).$ Draw a block diagram of the control system. Place in each block the appropriate transfer function