Please answer and elaborate your answer with explaination

Managing Capacity

A single-counter sandwich store has just been opened. Since day one, the store has been serving one customer who comes every 5 minutes to buy a sandwich. The store can serve a customer for 4 minutes. Based on these conditions, you as the store manager will need to calculate the following conditions:

a. The average number of customers in the waiting line

b. The average number of customers in the system

c. The average time spent by customers in the waiting line

d. The average time spent by customers in the system

e. The company standard of average time spent for customers to wait in line is 15 minutes. Can this company meet this standard? Elaborate your answer