Mickey runs around the block twice because half of 4 is <<4/2=2>>2.

Mickey runs 400 meters in total because 2 times 200 equals <<2*200=400>>400.

Johnny runs 800 meters because 4 times 200 equals <<4*200=800>>800.

In total, they run 1200 meters because 400 plus 800 equals 1200.

On average, they run 600 meters because 1200 divided by 2 equals <<1200/2=600>>600

# Answer

600
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Mickey and Johnny are having a contest to see who can run around their block the most. One time around the block equals 200 meters. Johnny runs around the block 4 times. Mickey runs around the block half as many times as Johnny. What is the average distance run by Johnny and Mickey?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
600
Mickey and Johnny are having a contest to see who can run around their block the most. One time around the block equals 200 meters. Johnny runs around the block 4 times. Mickey runs around the block half as many times as Johnny. What is the average distance run by Johnny and Mickey?
train