Final answer:
The average time between two successive visits to the urgent care facility is 3 minutes.
Step-by-step explanation:
Given that the average rate of patients arriving and being treated at the urgent care clinic is 20 per hour, we can calculate the average time between arrivals and treatments.
For arrivals, we divide 60 minutes by the arrival rate of 20 patients per hour, which gives us an average arrival time of 3 minutes.
Similarly, for treatments, we divide 60 minutes by the treatment rate of 20 patients per hour, resulting in an average treatment time of 3 minutes.
Therefore, the average time between two successive visits to the urgent care facility is 3 minutes.