3 customers entered a store over the course of 9 minutes. At what rate were the customers entering the store in minutes per customer?

Answer:
The rate of customers entering the store would be 3 minutes per customer.
Step-by-step explanation:
3 customers entered over the course of 9 minutes
We can simplify 3/9 to 1/3. That would mean 1 customer enters every 3 minutes.