Consider a project network that begins with activity X and is followed by activity Y. The earliest start time for activity X is 5 days and it will take 3 days to be completed. The earliest start time for activity Y is 12 days. Given this information, activity X has _____ of free slack.
A) 20 days
B) 4 days
C) 12 days
D) 9 days
E) 15 days

Question

Quizplus · Accepted Answer

Free slack (or free float) is the amount of time that a task can be delayed without delaying the early start date of any subsequent tasks. In this case, activity X starts at day 5 and takes 3 days to complete, so it finishes on day 8. Activity Y can start at day 12. Therefore, the free slack for activity X is the difference between its finish time and the start time of the next activity, minus the time it takes to complete the activity itself. Since activity Y starts on day 12 and activity X finishes on day 8, the free slack for activity X is 12 - 8 = 4 days.

Consider a Project Network That Begins with Activity X and Is