Two boats leave a port at the same time; one travels west at 20 mi/hr and the other travels south at 15 mi/hr. At what rate is the distance between them changing 30 minutes after they leave the port?
Two boats leave a port at the same time; one travels west at 20 mi/hr and the other travels south at 15 mi/hr. At what rate is the distance between them changing 30 minutes after they leave the port?