Aperipheral milling operation is performed on the top surface of a rectangular workpart which is 400 mm long and 60 mm wide. the milling cutter, which is 80 mm in a diameter and has five teeth overchanges the width of the part on both sides cutting speed = 70 m/min, chip load = 0.25 mm/tooth, and depth of cut = 5.0 mm.

determine
(a) the actual machining time to make one pass across the surface and
(b) the maximum material removal rate during the cut