What is the crash time for activity D?

• A. 20 days
• B. 14 days
• C. 18 days
• D. 22 days

Answer: (A)

Crash time is the minimum duration an activity can be completed in, achieved by adding resources to speed it up. It comes from the crash data for that activity. If D has a crash time of 20 days, that means you can finish D in 20 days at the maximum feasible acceleration, though at some additional cost. The reason this is the best answer is that it represents the fastest possible duration for D under crashing, which is exactly what “crash time” denotes. The other numbers would correspond to longer durations you could achieve with less aggressive crashing (or the normal duration if you’re not crashing). Remember, you typically crash activities on the critical path to reduce the overall project duration, but for this question the key point is identifying the minimum possible duration for the activity, which is 20 days.