PK0-005 Project Life Cycle Practice Question
A project manager is reviewing the project schedule. Activity A has an early start (ES) of day 1 and an early finish (EF) of day 5. Activity B has an ES of day 6 and an EF of day 10. Activity C has a duration of 2 days and depends on both A and B. What is the total float of Activity B if the project must be completed by day 12?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
0 days
Activity B has an early finish of 10. Activity C has a duration of 2 days and cannot start until both A and B are complete. Using a backward pass from the project deadline of day 12: C's late finish is 12, so its late start is 10. Therefore, B must finish by day 10 to not delay C. Total float = Late Finish (10) - Early Finish (10) = 0 days.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
2 days
Why it's wrong here
2 days is incorrect because it does not account for the dependency on Activity C. The late finish of B is constrained by C's start, not directly by the project end date.
- ✓
0 days
Why this is correct
Correct. Since C depends on B, B's late finish equals C's late start. With a project deadline of day 12 and C requiring 2 days (to start at day 10 and end at day 12), B's late finish is day 10, giving zero float.
- ✗
1 day
Why it's wrong here
1 day is incorrect because the calculation ignores the critical path influence of B on C.
- ✗
3 days
Why it's wrong here
3 days is incorrect as it would indicate excessive float not supported by the schedule constraints.
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