# Correct formula for determining the time to make one cut across a given distance

google is no help

Which of the following formulas is the correct formula for determining the

time to make one cut across a given distance? {T = time f = feed (IPR)

L = length of cut (inches) N = spindle speed (RPM)}

a) T = (fN) / L

b) T = f / NL

c) T = L / (fN)

d) T = (Lf) / N