Five jobs are waiting for processing through two work centers.Their processing time (in minutes)at each work center is contained in the table below.Each job requires work center Sigma before work center Delta.According to Johnson's rule,what sequence of jobs will minimize the completion time for all jobs?
A)R-S-T-U-V
B)S-V-T-R-U
C)S-U-T-V-R
D)V-R-U-S-T
E)R-V-T-S-U

Question

Five jobs are waiting for processing through two work centers.Their processing time (in minutes)at each work center is contained in the table below.Each job requires work center Sigma before work center Delta.According to Johnson's rule,what sequence of jobs will minimize the completion time for all jobs? 
A)R-S-T-U-V 
B)S-V-T-R-U 
C)S-U-T-V-R 
D)V-R-U-S-T 
E)R-V-T-S-U

Quizplus · Accepted Answer

Johnson's rule involves finding the shortest time for each job by comparing the time required at each work center. We start by identifying the jobs that can be processed immediately at either end (i.e., those with the shortest processing time at either work center). In this case, jobs R and V can be processed at work center Delta (with processing times of 3 and 5 minutes, respectively) and jobs S, T, and U can be processed at work center Sigma (with processing times of 2, 4, and 6 minutes, respectively). The next step is to compare the time required for jobs at each work center and arrange the jobs in order of shortest to longest total time. This gives us the sequence R-S-U-T-V, which corresponds to choice C.

Five Jobs Are Waiting for Processing Through Two Work Centers