.16.7. Reconsider the Reliable Construction Co. case study introduced in Section 16.1, including the complete project network obtained in Figure 16.5 at the end of Section 16.3. Note that the estimated durations of the activities in this figure turn out to be the same as the mean durations given in Table 16.4 (Section 16.4) when using the PERT three-estimate approach. Now suppose that the pessimistic estimates in Table 16.4 are used instead to provide the estimated durations in Figure 16.5. Find the new earliest times, latest times, and slacks for all the activities in this project network. Also identify the critical path and the total estimated duration of the project. (Table 16.5 provides some clues.) Follow the instructions for Problem 16.7 except use the optimistic estimates in Table 16.4 instead