XYZ Sub shop makes custom submarine sandwiches to order. They are analyzing the process at their shop. The general flow of the process is shown in the figure above. A different is working at each of the steps in the process. Each workstation is assigned one worker.

a$.$ What is the current maximum output $($capacity$)$ of the process of XYZ$?$

b$.$ If we add another person to increase the capacity, where would we add him or her?

c$.$ What is the maximum output $($capacity$)$ of the process of XYZ after adding one person $($in b$)?$

d$.$ Is there any benefit, if we can shift $1$ minute from Work Station $2$ to Work Station $1$ in the original design?

e$.$ Is there any benefit, if we can shift $1$ minute from Work Station $3$ to Work Station $4$ in the original design?