There are 5,280 feet in a mile, and there are 60 minutes in an hour. To find the speed in miles per hour, we can divide the speed in feet per minute by the number of minutes in an hour and then multiply by the number of feet in a mile.
So, 540 feet per minute divided by 60 minutes per hour is 9 feet per second. Then, 9 feet per second multiplied by 5,280 feet per mile is 47,520 feet per hour, which is approximately 9 miles per hour.
