PK0-005 Project Life Cycle Practice Question
A project manager is calculating the critical path. The network diagram shows two paths: Path A: A(3 days) → B(4 days) → C(2 days) = 9 days; Path B: D(5 days) → E(1 day) → F(3 days) = 9 days. Both have total float of zero. What is the total float for an activity on Path A?
⚠ Common exam trap
The trap is confusing an activity's duration (e.g., 3 days for A) with its total float, or assuming a tied path has slack; candidates must recall that critical-path activities always have zero total float.
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
Total float is the amount of time an activity can be delayed without delaying the project finish date. Activities on the critical path have zero total float by definition. Since both Path A and Path B are 9 days and both have zero float, every activity on Path A — including the one in question — has a total float of 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.
- ✗
1 day
Why it's wrong here
Total float is calculated as late finish minus early finish; both paths total 9 days, so every activity on Path A sits on the critical path with zero float. One day would apply only if a parallel path were longer by a day, giving that activity slack.
- ✗
3 days
Why it's wrong here
Total float is late finish minus early finish; with both paths at 9 days, Path A is critical and its activities carry zero float. Three days would require a competing path of 12 days, which the diagram does not show.
- ✓
0 days
Why this is correct
Total float equals the difference between the critical path duration and the activity's longest path. Both paths total nine days and both have zero float, so Path A is also critical; any activity on it therefore has zero days of scheduling flexibility.
- ✗
2 days
Why it's wrong here
Float equals the difference between the path duration and the longest path; Path A and Path B both total 9 days, so activities on Path A have zero float. Two days would arise only if the competing path finished two days later, creating that slack.
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Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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