Consider the following work breakdown structure:
What is the estimated slack time for activity D?
A) 0 days
B) 30 days
C) 40 days
D) 50 days
E) 100 days

Question

Consider the following work breakdown structure: 
What is the estimated slack time for activity D?
A) 0 days 
B) 30 days 
C) 40 days 
D) 50 days 
E) 100 days

Quizplus · Accepted Answer

To calculate the slack time for activity D, we need to determine the critical path for the project. 
The critical path is A-B-C-D-F-G-I-K-L, which has a total duration of 290 days.
Activity D has a duration of 60 days, and it is not on the critical path, so it has some slack time. 
To calculate the slack time, we subtract the duration of the activity from the latest finish time (LF) minus the earliest finish time (EF). 
For activity D: 
LF = 210 
EF = 150 
Slack time = LF - EF - duration =  210 - 150 - 60 = 0 
Therefore, the estimated slack time for activity D is 0 days. 
The best choice is B because it is the only option that is correct.

Consider the Following Work Breakdown Structure