Operation P$4$ occurs seperately from and simultaneously with operations$$ P$1-$P$3.$

Operation P$5$ has three parallel and identical$$ lines; therefore, each part only needs to go through one of the three lines.

$$a$)$ The bottleneck of this system is station P

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enter your response here.

$$b$)$ The bottleneck time of the system is

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enter your response here minutes per unit.

$$c$)$ The throughput time is

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enter your response here minutes per unit.