4. In Example 6.5-4, use the floats to answer the following:
(a) If activity B is started at time 1, and activity C is started at time 5, determine the earliest
start times for E and F.
(b) If activity B is started at time 3, and activity C is started at time 7, determine the earliest
start times for E and F.
(c) How is the scheduling of other activities impacted if activity B starts at time 6?
*5. In the project of Example 6.5-2 (Figure 6.42), assume that the durations of activities B
and F are changed from 6 and 11 days to 20 and 25 days, respectively.
(a) Determine the critical path.
(b) Determine the total and free floats for the network, and identify the red-flagged
activities.