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Parts P1-P7 are machined first on a milling machine and then polished at a separate machine. Using the information in the following table, the minimum total completion time required for carrying out both the operations for all 7 parts is __________ hours.
  • a)
    31
  • b)
    33
  • c)
    30
  • d)
    32
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Parts P1-P7 are machined first on a milling machine and then polished ...

According to Johnson’s algorithm, optimum job sequence is,
P3 → P4 → P5 → P1 → P6 → P2 → P7
Minimum total completion time:-

The minimum total completion time required for carrying out both the operations for all 7 parts is 33 hours.
Hence, the correct option is (B).
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