3. A print shop has the following jobs available at 7 A.M.:

Processing Times Job Machine 1 Machine 2 All jobs in the print shop must fmt be processed on machine 1 and then on machine 2. The shop stays open until all jobs are completed, and no other jobs arrive during the day. Processing times are given in hours.

a. Show how the processing of the three jobs is equivalent to a project by drawing an appropriate precedence network. Calculate the total slack associated with each job.

b. If the print shop manager sequences the jobs using slack (that is, the job with the smallest slack has the highest priority), what is the project duration? Is there another sequence that will reduce the project duration? Is this the minimum project duration? Explain your reasoning.

c. What is the critical resource in this problem? Why?