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Question
Use Johnson's rule to determine the optimal sequencing for the five jobs to be processed on two machines in a fixed order (Machine 1 before Machine 2). The processing times in hours are given in the table below.
a. What is the optimal sequence?
b. What is the total flow time for this sequence?
| Job | Machine 1 | Machine 2 |
| A | 10 | 11 |
| B | 8 | 17 |
| C | 14 | 10 |
| D | 13 | 7 |
| E | 10 | 8 |
| F | 25 | 9 |
| G | 6 | 15 |
Answer
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