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
(a, b) The optimal sequence is G-B-A-C-F-E-D, and the total flow time is 93 hours, as shown in the software solution below.
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