A binary mixture containing 30 mol n-pentane and 70 mol n-hexane will be separated in a distillation column operating at 10 atm pressure. The L/V ratio of the rectifying section is 0.5 and the steam flow is 120 mol/h. Determine the ratio of the stripping section for the following feed conditions: a) the feed is 10% vaporized, b) the feed is 50% vaporized, and c) the feed enters the column as saturated vapor.