A liquid mixture of benzene (B) and toluene (T) containing 40 wt% T is fed continuously to a distillation column. A product stream leaving the top of the column (top product) contains 70 wt% B and a bottom product stream with 100 kg/s flow rate. Given the ratio of (bottom product flow rate) to (top product flow rate) is 0.5. Calculate the flow rate of benzene in the feed stream O a. 140 kg/s O b. 180 kg/s OC. 100 kg/s O d. 160 kg/s O e. 120 kg/s Of 200 kg/s