Mary runs at 5 miles per hour, so after 1 hour she would have covered a distance of 5 miles.
Jimmy runs at 4 miles per hour, so after 1 hour he would have covered a distance of 4 miles.
Since they are running in opposite directions, the distance between them is the sum of the distances they have covered, which is 5 miles + 4 miles = 9 miles.
#### 9
The answer is: 9
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Mary and Jimmy start running from the same spot, but in opposite directions. Mary runs at 5 miles per hour and Jimmy runs at 4 miles per hour. What is the distance between them after 1 hour?

### Answer:
