PK0-004 Question #428: Real Exam Question with Answer & Explanation

The correct answer is B: Six days. To find the critical path, trace all possible paths from start to finish and identify the longest one. Task A runs Days 1–2. Task B runs Days 3–4 (starts Day 3 independently). Task C starts after A (Day 3) and runs Days 3–5 (duration 3). Task D starts after BOTH B and C are compl

Question

Task A starts on Day 1 and has a duration of two days. Task B has a duration of two days and starts on Day 3. Task C starts after Task A and has a duration of three days. Task D starts after Task B and Task C and has a duration of one day. Which of the following represents the critical path?

Options

AFive days
BSix days
CSeven days
DEight days

Explanation

To find the critical path, trace all possible paths from start to finish and identify the longest one. Task A runs Days 1–2. Task B runs Days 3–4 (starts Day 3 independently). Task C starts after A (Day 3) and runs Days 3–5 (duration 3). Task D starts after BOTH B and C are complete; B finishes Day 4, C finishes Day 5, so D starts Day 6 and runs for 1 day, finishing Day 6. Path 1 (A→C→D): 2 + 3 + 1 = 6 days. Path 2 (B→D): B starts Day 3, so from project start it effectively spans days 3–4 then D on day 6 = 6 days total project duration. The critical path through A→C→D drives the project to completion at Day 6 (six days). Any delay on this path delays the project.

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