hardMultiple Choice
PK0-005 Practice Question: A project manager is working on a construction…
A project manager is working on a construction project and needs to calculate the total float for a non-critical path activity. The activity has an early start of day 5, late start of day 10, early finish of day 15, and late finish of day 20. What is the total float?
⚠ Common exam trap
It's easy for candidates to confuse activity duration (Early Finish minus Early Start) or individual dates (Late Start or Late Finish) with the float calculation, leading candidates to pick 15, 20, or 10 days instead of correctly computing the difference.
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
✓
5 days
Total float is calculated as Late Start minus Early Start (or Late Finish minus Early Finish). Here, Late Start (10) minus Early Start (5) equals 5 days. This represents the amount of time the activity can be delayed without affecting the project's overall completion date.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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15 days
Why it's wrong here
Fifteen days is the early finish value, not the float; total float is late finish minus early finish (20 − 15 = 5). It is tempting because early finish is a prominent schedule figure and subtracting early start from it gives the activity duration.
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20 days
Why it's wrong here
Twenty days equals late finish, not float; total float is late start minus early start (10 − 5 = 5) or late finish minus early finish (20 − 15 = 5). It is tempting because late finish is the largest date in the activity's schedule data.
- ✓
5 days
Why this is correct
Total float equals late start minus early start, or late finish minus early finish: 10 minus 5, and 20 minus 15, both giving 5 days. This satisfies the calculation requested for the non-critical path activity.
- ✗
10 days
Why it's wrong here
Ten days is the late start value, not the float; total float is late start minus early start (10 − 5 = 5). It is tempting because the late dates differ from the early dates by five days, and ten is the first late date encountered.
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