If Juan takes 4 hours to move from his office to grab lunch, moving from his office and back takes 2*4=<<4*2=8>>8 hours.

The time Juan takes to grab his lunch from his office and back is half the time he takes to read a book, meaning he reads a book in 8*2=<<8*2=16>>16 hours.

If he has a 4000-page book, he will read 4000/16=<<4000/16=250>>250 pages in an hour.

# Answer

250
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The time Juan takes to grab his lunch from his office and back is half the time he takes to read a book. If he has a 4000-page book, how many pages does he read in an hour if he takes 4 hours to move from his office to grab lunch?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
250
The time Juan takes to grab his lunch from his office and back is half the time he takes to read a book. If he has a 4000-page book, how many pages does he read in an hour if he takes 4 hours to move from his office to grab lunch?
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