Two jobs (J1 and J2) are scheduled on two workcenters (WCA and WCB). J1 starts at time 0 on WCA and finishes on that workcenter at time 5. J2 starts at time 0 on WCB and finishes at time 3. J2 then starts on WCA at time 5 and finishes at time 9. What is the average queue time of these jobs?
A) 0
B) 1
C) 2
D) Cannot be determined from the information given

Question

Quizplus · Accepted Answer

The queue time for a job is the time it waits before it can start processing on a workcenter. For J1, the queue time is 0 since it starts processing right away. For J2, the queue time on WCB is 0 since it starts processing right away, but the queue time on WCA is 2 (it starts at time 5 but J1 finishes at time 3) for a total queue time of 2. The average queue time is then (0+2)/2 = 1.

Two Jobs (J1 and J2) Are Scheduled on Two Workcenters