Customers arrive at an airline check-in counter at a rate of 25 customers per hour on average, following a Poisson process. There are 4 check-in counters open, and each can serve customers at an average rate of 10 customers per hour. The service times are exponentially distributed. What is the average utilization of the check-in counters? What is the average wait time in queue for customers in minutes?

Utilization:

Average Waiting Time: