There are five jobs in a factory. All these jobs have to go through two workstations for processing. Each job is processed on Workstation #1 and then on Workstation #2. The processing time for each job on each workstation is given below. Job; Time on Workstation #1 (minutes); Time on Workstation #2 (minutes)
A; 50; 50
B; 20; 8
C; 25; 50
D; 30; 12
E; 11; 22
F; 11; 19

Using Johnson's sequencing rule, it can be concluded that the makespan of the sequence is:

a. more than 50 but less than or equal to 100 minutes.
b. more than 100 but less than or equal to 150 minutes.
c. more than 150 but less than or equal to 200 minutes.
d. more than 200 but less than or equal to 250 minutes.

More than 150 but less than or equal to 200 minutes ( C )

Explanation:

using Johnson's sequencing rule

attached below is a tabular solution of showing the use of Johnson's sequencing rule

The End of job sequence B = 172 minutes which means that the make span of the sequence is  More than 150 but less than or equal to 200 minutes

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