A two-spindle drill simultaneously drills a 1/2-in hole and a 3/4-in hole through a workpiece that is 1.0 in thick. Both drills are twist drills witb point angles of 1180. Cutting speed for the material is 230 ft/min. The rotational speed of each spindle can be set, individually. The feed rate for both holes must he set to the same value because the two spindles lower at the same rate. The feed rate is set so the total metal removal rate does not exceed 1.50 ins/min. Determine
(a) the maximum feed rate (in/min) that can be used,
(b) the individual feeds (in/rev) that result for each hole, and
(c) the time required to drill the holes.