In a face milling operation, the depth of cut is 6 mm, and the table moves (i.e., feed rate) at 10 mm/s. The width of the workpiece is 50 mm, and the cutter has a diameter of 81 mm. The rotational speed of the cutter is 120 rpm, and the feed is 0.25 mm per tooth. If the length of the workpiece is 250 mm, calculate the number of teeth of the cutter, the metal-removal rate, and the milling time.