What is the earliest that Activity D can begin if Activity A takes 3 days, Activity B takes 5 days, and Activity C takes 7 days?
A) day 15
B) day 7
C) day 5
D) day 3

Question

What is the earliest that Activity D can begin if Activity A takes 3 days, Activity B takes 5 days, and Activity C takes 7 days? 
A) day 15 
B) day 7 
C) day 5 
D) day 3

Quizplus · Accepted Answer

Activity D cannot begin until Activity C is completed, which takes 7 days. Therefore, the earliest that Activity D can begin is on day 8. However, Activity B takes 5 days, so it must be started at least 5 days before day 8, which is day 3. Activity A takes 3 days, so it can begin on day 1, allowing Activity B to begin on day 4 and Activity C to begin on day 9. This leaves day 8 open for Activity D to begin, making the answer B.

What Is the Earliest That Activity D Can Begin If