During turning of a metallic rod at a given condition, the tool life was founded to decrease from 100 min. to 25 min. ool if: cutting speed was increased from 50 $$\frac{m}{min}$$ How muchwill be life of tool if the machined at 80$$\frac{m}{min}$$?

A

38.06 min.

B

39.06 min.

C

40.06 min

D

41.06 min.