II$.$ Process Flow Diagram for Making a Shirt, with an Additional Worker

All steps $($A$,$ B$,$ C$,$ D$,$ and E$)$ in the below process are necessary to create each finished unit. Task times are shown for each step. A second worker has been hired to duplicate task D$.$ Now shirts that have been through task C go to any one of the two workers on task D $.$ The product still requires the five steps $(A,B,C,D,E.$

$10$ mins.$/$unit

$12$ mins.$/$unit

$3.$ Refer to the Process Flow Diagram for Making a Shirt, with an Additional Worker. Assume the entire process is running at the pace of the bottleneck. Consider only task D$,$ with both workers ironing shirts. What is the capacity utilization for ironing?

$4.$ Refer to the Process Flow Diagram for Making a Shirt, with an Additional Worker. What is the minimum throughput time, that is$,$ the fastest a rush order of one unit can go through the process?