Problem 9 - Page 658, Q11 a, b 11. Given the operation times in the two-work-centre flow shop below: a. Develop a job sequence that minimizes total idle time at Work Centre 2. b. Construct a load Gantt chart for the activities at the two work centres, and determine work centre 2's idle time. LO3 Job Times (minutes) B D E F Work Contro 1 Work Centro 2 20 27 16 30 43 51 60 12 35 28 42 24 (minimizing idle time accomplishes the same task as minimizing make-span) Activity Precedes F,H E F A B D E F G H 1 Duration in weeks 4 5 7 12 6 6 3 4 7 5 Available Cost of weeks to Crash Crashing 1 $300 2 $200 1 $500 2 $300 2 $700 1 $500 0 N/A 1 $200 1 $800 1 $200 G I end a) Draw the precedence network b) Indicate the paths to project completion, their duration, and slack. Which one is the critical path? c) For each activity, use the PERT/CPM solution technique to show the early start, early finish, last start, and late finish d) We need to reduce the project by 4 weeks - which activities do we crash? What is the total cost of crashing this project