Question 1
Five jobs are waiting for processing through two work centres. Their processing time (in minutes) at each work centre is contained in the table below. Each job requires work centre Alpha before work centre Beta. According to Johnson's rule, which job should be scheduled first in the sequence?
| Job | Alpha | Beta |
| R | 20 | 10 |
| S | 25 | 35 |
| T | 50 | 20 |
| U | 15 | 35 |
| V | 55 | 75 |
◦ R
◦ T
◦ V
◦ S
◦ U
Question 2
Five jobs are waiting for processing through two work centres. Their processing time (in minutes) at each work centre is contained in the table below. Each job requires work centre Sigma before work centre Delta. According to Johnson's rule, what sequence of jobs will minimize the completion time for all jobs?
| Job | Sigma | Delta |
| R | 40 | 10 |
| S | 25 | 30 |
| T | 50 | 20 |
| U | 35 | 35 |
| V | 55 | 15 |
◦ V-R-U-S-T
◦ R-S-T-U-V
◦ S-U-T-V-R
◦ S-V-T-R-U
◦ none of the above
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