Given that cutting speed = 9 m/min, the return time to cutting time ratio is = 1 : 2 to the feed rate = 0.3 mm/stroke, the clearance at each of cut = 25 mm and that the plate is fixed 700 mm side along the direction of tool travel, the time required for finishing one flat surface of a plate of size \[700\times 300\,\,mm\] in a shaper, will be:

• A. 10 min             
• B. 12.5 min
• C. 15 min             
• D. 20 min