Criston Sand is fresh manufacturing and selling sandwichesordered by customers. The sandwich ordered is packaged with drinks,salads and fruits and given to customers. First of all, in thewaiting line, customers refer to the menu on the wall and fill outthe order on the order sheet and pass it on to one of the employeeswho are making sandwiches. Customers then go to the next locationand choose the items (e.g., snacks, desserts, etc.) to order andhead to the checkout counter. After paying at the checkout counter,you receive the sandwich you ordered at the guided location.Customers use an average of 45 seconds to order sandwiches (seemenu, select, and fill out the order sheet). Assume that theaverage number of visits to all activities is one. It takes 90seconds to make a sandwich. 60 seconds will be used to selectadditional orders. It takes 40 seconds to calculate at the counter.It takes 20 seconds to get the finished sandwich. Currently,Criston Sand employs two cashier clerks, six sandwich-making staffand one staff member who hand over a manufactured sandwich. Longqueues are often formed, especially during busy times of the day,such as lunchtime. In this case, can increasing the number ofsandwich-making staff help reduce customer queues?