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

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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

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