On average, a patient spends $5$ minutes waiting and $15$ minutes being treated at C&A Clinic. The average number of patients waiting and being treated at the clinic is $50.$ What is the average flow rate of patients per minute on a typical day?

On average, a patient spends $5$ minutes waiting and $15$ minutes being treated at C&A Clinic. The average number of patients waiting and being treated at the clinic is $50.$ What is the average flow rate of patients per minute on a typical day?

$0\mathrm{.}5$

$20$

$50$

$2\mathrm{.}5$