He traveled down 10*5=<<10*5=50>>50 feet.

So he is at an elevation of 400-50=<<400-50=350>>350 feet.

# Answer

350
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John starts at an elevation of 400 feet.  He travels downward at a rate of 10 feet down per minute for 5 minutes.  What is his elevation now?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
350
John starts at an elevation of 400 feet.  He travels downward at a rate of 10 feet down per minute for 5 minutes.  What is his elevation now?
train