Recall our model of Queueing Theory$/$Waiting Line Analysis from class.$$

Students must have their schedule approved by an academic advisor. It takes the advisor an average of $5$ minutes to approve a schedule. Students arrive at the advisor's office at a rate of $4$ per hour.$$

What is the average amount of time a student spends waiting in the queue to see the academic advisor?$$

Group of answer choices

$2$ minutes $30$ seconds

$3$ minutes

$18$ minutes

$1$ minute $15$ seconds

$0$ minutes

$2$ minutes