Final answer:
John's rate of speed is approximately 9.961 miles per hour.
Step-by-step explanation:
To find John's rate of speed in miles per hour, we can use the formula:
Rate of speed = Distance / Time
Given that John runs 7 miles in 45 minutes, we can substitute these values into the formula:
Rate of speed = 7 miles / 45 minutes
We need to convert minutes to hours, since the rate of speed is in miles per hour. There are 60 minutes in an hour, so:
Rate of speed = 7 miles / 45 minutes * (1 hour / 60 minutes)
Simplifying the expression, we get:
Rate of speed = 7 miles / 27 minutes per hour
Therefore, John's rate of speed is approximately 0.259 miles per minute, or 9.961 miles per hour (rounded to three decimal places).