During turning of a metallic rod at a given condition, the tool life was found to decrease from 100 min to 25 min. When cutting speed was increased from 50 m/min. to 100 m/min. How much will be life of tool if machined at 80 m/min.?
- A. 38.06 min.
- B. 39.06 min.
- C. 40.06 min.
- D. 41.06 min.
Answer: B. 39.06 min.