a two-spindle drill cuts two holes at the same time, one 1/2 inch and one 3/4 inch. the workpiece is 1.0 inches thick. both drills have point angles of 118 degrees and the cutting speed for the material is 300 ft/min. the rotational speed of each drill can be set individually but the feed rate for both holes must be set to the same value because they move together into the material. the feed rate is set so that the total metal removal rate of both drills combined does not exceed 1.50 in3/min. determine (a) maximum feed rate (in/min) that can be used, (b) individual feeds (in/rev) for each hole, and (c) cutting time for the operation