A machine job is due to be completed in 15 hours and is completed in 19 hours due to equipment breakdown. What is the tardiness of this task?

Rationale

The tardiness of this task is 4 hours.

Tardiness is defined as the amount of time a task is completed beyond its due date. In this scenario, the job was due in 15 hours but took 19 hours to complete, resulting in a tardiness of 19 - 15 = 4 hours.

A (-4) YOUR ANSWER

A tardiness value of -4 would indicate that the job was completed 4 hours early, which contradicts the information provided. Since the job was completed later than the due date, the tardiness cannot be negative.

B (0) YOUR ANSWER

A tardiness of 0 would suggest that the task was completed exactly on time, which is not the case here. The job was due in 15 hours but was completed in 19 hours, so there is a clear delay, and thus the tardiness cannot be zero.

C (4) CORRECT

This is the correct choice. The task took 19 hours to complete, which is 4 hours longer than the original 15-hour deadline. Therefore, the tardiness is calculated as 19 - 15 = 4 hours, indicating a delay in completion.

D (19) YOUR ANSWER

A tardiness of 19 would imply that the task was completed 19 hours late, which is incorrect. The task was only late by the difference between its due time and actual completion time, which is 4 hours, not the total time taken.

Conclusion

Tardiness is a measure of how late a task is beyond its deadline. In this case, the task was due in 15 hours but took 19 hours to complete, leading to a tardiness of 4 hours. Understanding tardiness is crucial for effective time management and scheduling in any operational context.

A machine job is due to be completed in 15 hours and is completed in 19 hours due to equipment breakdown. What is the tardiness of this task?

The tardiness of this task is 4 hours.

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