The trim line at PW is a small subassembly line that, along with other such lines, feeds into the final chassis line. The entire assembly line, which consists of more than 900 workstations, is to make PW's new E cars. The trim line itself involves only 13 work elements and must handle 20 cars per hour. Work-element data are as follows:

\fWork Element Time (Sec) Immediate Predecessor(s) 1.4 D 1.4 F. G 0.5 F XC H 1.0 C M 0.8 I, K. L