The rate is 360/3=<<360/3=120>>120 mph.

Then it would take 240/120=<<240/120=2>>2 additional hours.

# Answer

2
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A train travels 360 miles in 3 hours. At the same rate, how many additional hours would it take to travel an additional 240 miles?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2
A train travels 360 miles in 3 hours. At the same rate, how many additional hours would it take to travel an additional 240 miles?
train