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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

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