A CNC vertical milling machine has to cut a straight slot of $10 \mathrm{~mm}$ width and $2 \mathrm{~mm}$ depth by a cutter of $10 \mathrm{~mm}$ diameter between points (0,0) and (100,100) on the $X Y$ plane (dimensions in $m m$ ). The feed rate used for milling is $50 \mathrm{~mm} / \mathrm{min}$. Milling time for the slot (in seconds) is
(A) 120
(B) 170
(C) 180
(D) 240
A CNC vertical milling machine has to cut a straight slot of $10 \mathrm{~mm}$ width and $2 \mathrm{~mm}$ depth by a cutter of $10 \mathrm{~mm}$ diameter between points (0,0) and (100,100) on the $X Y$ plane (dimensions in $m m$ ). The feed rate used for milling is $50 \mathrm{~mm} / \mathrm{min}$. Milling time for the slot (in seconds) is
(A) 120
(B) 170
(C) 180
(D) 240