Need help on this practice question.

Consider the Starbucks at Campbell-75 intersection which operates from 10 am to 10 pm. Suppose there are m = 4 baristas, and each barista can prepare an order in p = 3 mins on average where is exponentially distributed. Assume that the service time contains the payment time as well. Throughout the dav. customers arrive with rate 1/a = 60 per hour, following poisson arrival process. Please fill in the blanks only with numeric answers. (Hint: Poisson arrival process means the inter-arrival times are exponentially distributed.) Average inter-arrival time of customers is min. Average utilization is Coefficient of variation for the inter-arrival time is Coefficient of variation for the service time is Average waiting time in the queue (VUT) is min. Average number of people in the queue is (Do not round to the nearest integer)