The movie last 2.5*60=<<2.5*60=150>>150 minutes

So he uses the bathroom 150/50=<<150/50=3>>3 times

# Answer

3
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John uses the bathroom every 50 minutes.  How many times does he use the bathroom during a 2.5-hour movie?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
John uses the bathroom every 50 minutes.  How many times does he use the bathroom during a 2.5-hour movie?
train