A distillation column is to be designed to separate 30,000 kg/h of a mixture of 40 percent benzene and 60 percent toluene into an overhead product containing 97% benzene and a bottom product containing 98% toluene. These percentages are by weight. A reflux ratio of 3 mol to 1 mol of product is to be used. The molal latent heat of benzene and toluene are 7630 and 7960 cal/gmol, respectively. Benzene and toluene form a nearly ideal mixture with a relative volatility of about 2.5. The feed has a boiling point of 95C at a pressure of 1 atm. Determine the slope of the Rectifying Section Operating line. Answer in 2 significant figure.