A CNC vertical milling machine has to cut a straight slot of $10$ mm width and $2$ mm depth by a cutter of $10$ mm diameter between points $(0,0)$ and $(100,100)$ on the XY plane (dimensions in mm). The feed rate used for milling is $50$ mm/min, Milling time for the slot ( in seconds) is
- $120$
- $170$
- $180$
- $240$