He runs the race in 5/15=1/3 of an hour

So he runs the race in 60/3=<<60/3=20>>20 minutes

That means he beat the next fastest guy by 23-20=<<23-20=3>>3 minutes

# Answer

3
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John manages to run 15 mph for his whole 5-mile race.  The next fastest guy ran the race in 23 minutes.  How many minutes did he win the race by?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
John manages to run 15 mph for his whole 5-mile race.  The next fastest guy ran the race in 23 minutes.  How many minutes did he win the race by?
train