Question $2.$ A Face milling operation is performed on a rectangular workpiece that is $350$ mm long by $60$ mm wide by $56$ mm thick. The $85-mm-$diameter milling cutter has $6$ teeth, is $80$ mm wide, and overhangs the work on either side by $10$ mm $.$ The operation reduces the thickness of the piece to $50$ mm $.$ Cutting speed $=0\mathrm{.}50\frac{m}{s}$ and chip load $=0\mathrm{.}34m\frac{m}{?}$ tooth $.$ Determine the $($a$)$ machining time and $($b$)$ metal removal rate once the cutter reaches full depth.