A mild steel plate 400m$\times 800mm\times 30mm$
is to be shaped along its wider face. The ratio of return time to cutting time is 2 : 3 and the feed per cycle is 2mm. Tool approach and over – travel respectively are 50mm latch and cutting speed of tool is 24m/min. Calculate the machining time required for machining the given plate wih H.S.S tool
(a) 5 min (b) 20 min
(c) 13 min (d) 17 min