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Seven tasks are to be performed on two work stations. Drilling and painting. Task times are...

Seven tasks are to be performed on two work stations. Drilling and painting. Task times are given below .

FIRST STATION DRILING

SECOND STATION PAINTING

A

18

10

N

16

13

C

2

7

D

10

16

E

13

20

F

14

4

G

7

7

In which order would you perform these task? Explain your work:
business   Operations-Management   
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Answer #1

Use Johnson's rule to find the sequence of jobs for minimum makespan.

The minimum processing time is 2, for C, on Drilling. Schedule C the earliest. C, _, _, _, _, _, _
The next minimum processing time is 4, for F, on Painting. Schedule F the latest. C, _, _, _, _, _, F
The next minimum processing time is 7, for G, on Drilling. Schedule G the earliest. C, G, _, _, _, _, F
The next minimum processing time is 10, for A, on Painting. Schedule A the latest. C, G, _, _, _, A, F
The next minimum processing time is 10, for D, on Drilling. Schedule A the earliest. C, G, D, _, _, A, F
The next minimum processing time is 13, for E, on Drilling. Schedule A the earliest. C, G, D, E, _, A, F

So,

the final optimal sequence is C, G, D, E, B, A, F

Gantt chart

The minimum makespan in 84

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