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Tool life testing on a lathe under dry cutting conditions gave ‘n’ and ‘C’ of Taylor tool life equation as 0.12 and 130 m/min, respectively. When a coolant was used, ‘C’ increased by 10%. The increased tool life with the use of coolant at a cutting speed of

(a) 47.4min                            (b) 37.4min

(c) 27.4min                             (d) 17.4min

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