The following series reactions take place in the liquid phase: A --> B --> C The rate of destruction of A is -A = kCA and the rate of formation of C is rc = K2CB, respectively. The rate constants are k = 0.1 min and k = 0.2 min. The reaction is carried out in a CSTR and the feed has a concentration of 20 mol of A per m. What is the space time, in minutes and expressed as a whole integer, that maximizes the outlet concentration of B? Note: One approach to this problem is to construct a plot of space time versus CB and then determine where the plot is maximized. Using your favorite math solver will make your work easier.