dolution

The results of observing guests sitting at a local community center for a month are as follows. Window staff: 2 people (everyone handles all tasks) Number of guests: It varies from time to time, but an average of 20 people come in per hour. Service time: It varies from customer to customer, but it takes an average of 5 minutes. Waiting time: It varies from customer to customer, but wait an average of 3 minutes after drawing a number ticket. 1) How much is the utilization of the teller? 2) What is the cycle time of the community center? (Caution) If the answer is 1/2, you should explain how 1/2.