A company can easily expand its service operation by adding more servers to its process. If each server is able to process 8 customers per hour and customers arrive at the company at the rate of 20 per​ hour, then how many servers should be employed to achieve the standard that no customer should have to wait more than 60 seconds to be​ served? What is the average utilization of the servers for the number of servers required to meet this service​ goal?