If v=cutting speed, s= feed in mm, b=width of work in mm, m=the ratio between the return time to cutting time and l= length of the cutting stroke in mm. Then, find the formula for time.

• A. (l*b*m) / ( 1000*v*s)
• B. (l*b*(1+m) ) / ( 1000*v*s)
• C. (l*b*v) / ( m*s*1000)
• D. none of the mentioned