A call center has $m=10$ agents. On average, there are $30$ phone calls arriving to this call center in an hour. It takes each agent on average $8$ minutes to answer one phone call. Assume the coefficients of variation for the inter$-$arrival time and service time are both $1.$ Keep $2$ decimal places if required.

Question $1(1$ point$)$

a$.$ What is the average inter$-$arrival time a in $[$minutes$/$call$]?(1$ point$)$