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 service rate of the academic advisor?

$3$ students per hour

$5$ students per hour

$10$ students per hour

$12$ students per hour