A first-order irreversible liquid phase reaction $A\rightarrow B\left ( k=0.1\:min^{-1} \right )$ is carried out under isothermal, steady state conditions in the following reactor arrangement comprising an ideal $CSTR$ (Continuous-Stirred Tank Reactor) and two ideal $PFRs$ (Plug Flow Reactors). From the information in the figure, the volume of the $CSTR$ (in Liters) is ______________ (rounded off to the nearest integer).
