The Russell Auto Repair Shop uses a shop floor control system based on forward scheduling to determine auto completion dates for their customers, and to determine when to release a car to the shop for repairing. The control system generates a Gantt chart on a daily basis, along with a number of statistics. The shop is open for business eight hours per day, and there are three repair centers in the shop. Activity for the most recent few days is shown below. The jobs are listed in order of customer arrival, and are scheduled for processing on a first-come-first-served basis. Determine what the promise times should be, along with the make span, the average flow time, and the average queue time.
Job Workcenter Est. Hours
1 A/1, B/3, C/2
2 A/2, C/3
3 B/1, A/2, C/1
4 A/3, C/2, B/2
5 C/1, B/4, A/2