A 150 mm long, 12 mm diameter 304 stainless steel rod is being reduced in diameter to 11.5 mm
by turning on a lathe. The spindle rotates at 11.5 mm and the tool is travelling at an axial speed
of 200 mm/min. The time taken for cutting is given by
(a) 30 s (b) 36 s (c) 1 minute (d) 45 s