Two cutting tools are being compared for a machining operation. The tool life equations are Carbide tool : $$VT^{1.6} = 3000$$; HSS tool : $$VT^{0.6} = 200$$, where V is the cutting speed in m/min and T is tool life in min. The carbide tool will provide higher tool life, if the cutting speed in m/min exceeds

A

39.4

B

15

C

60

D

49.3