please help, I'm more interested in the steps 10:

9:

Cubway, the sandwich shop, is run by Jim, Tim and Kim. When a customer arrives, Jim spends 5 minutes taking order from the customer. After this, Tim prepares bread and Kim prepares filling for the order. These activities are performed in parallel, and take 7 and 12 minutes respectively. Jim then assembles the bread and filling, which takes 5 minutes of his time. Finally, Tim spends 2 minutes in delivering the order and taking payment. What is maximum number of sandwiches Cubway can make per hour? (In other words, what is the capacity of the process in sandwiches per hour?) A doctor's office has 3 types of workers: physician, nurses, and receptionists. On average, a physician sees each patient for 55 minutes, a nurse spends 35 minutes with each patient, and a receptionist spends 5 minutes with each patient. Suppose there is only one receptionist, whose utilization is 0.6 at current level of demand (you can assume that they are able to meet the demand). What is the minimum number of nurses they must have (to meet the demand)