4.) if a restaurant can process food orders at a rate of 15 per hour, and during its busy period an average of 5 customers are in the restaurant, how long would a customer expect to wait for her order to be served, assuming there is very little variability in the food preparation time?

a. 40 minutes

b. 10 minutes

c. 20 minutes

d. 30 minutes

5.) A factory making integrated circuits starts 1,000 of the wafers used in the circuits each day. This start rate has been steady for many months. Management has tracked the work-in-process in the factory and found it to average 45,000 wafers. What is the flow time for a wafer passing through the factory?

a. 0.02 days

b. 45 days

c. 90 days

d. 1 day

please solve correctly