In 1 hour, Mary will have traveled 5 miles/hour * 1 hour = <<5*1=5>>5 miles.

In 1 hour, Jimmy will have traveled 4 miles/hour * 1 hour = <<4*1=4>>4 miles.

Since they are running in opposite directions, the distance between them will be 5 miles + 4 miles = <<5+4=9>>9 miles.

# Answer

9
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
9
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?
train