Final answer:
The runner ran at a speed of 0.45 miles per minute.
Step-by-step explanation:
To calculate the speed of the runner in miles per minute, we need to convert 27 miles per hour to miles per minute. There are 60 minutes in an hour, so to convert miles per hour to miles per minute, we divide the speed in miles per hour by 60. Therefore, the runner was running at a speed of 0.45 miles per minute.