Consider the portion of a project depicted by this graph: What is the earliest finish time for activity 10-11 (far right-hand side) if the earliest start time of 8-10 (upper left-hand side) is 12 and the earliest start time of 9-10 (lower left-hand side) is 13?
A) 22
B) 23
C) 24
D) 25
E) 26

Question

Consider the portion of a project depicted by this graph:  What is the earliest finish time for activity 10-11 (far right-hand side) if the earliest start time of 8-10 (upper left-hand side) is 12 and the earliest start time of 9-10 (lower left-hand side) is 13?
A) 22 
B) 23 
C) 24 
D) 25 
E) 26

Quizplus · Accepted Answer

Activity 8-10 has a duration of 10, so its earliest finish time is 12+10=22.
Activity 9-10 has a duration of 9, so its earliest finish time is 13+9=22.
Since activity 10-11 can only begin after both activities 8-10 and 9-10 are completed, its earliest start time is the maximum between the finish times of activities 8-10 and 9-10, which is 22. Activity 10-11 itself has a duration of 3, so its earliest finish time is 22+3=25. Therefore, the correct answer is B.

Consider the Portion of a Project Depicted by This Graph