The rate is 270/3=<<270/3=90>>90 mph.

Then it takes an additional 180/90=<<180/90=2>>2 hours.

# Answer

2
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A train travels 270 miles in 3 hours. At the same rate, how many additional hours would it take to travel an additional 180 miles?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2
A train travels 270 miles in 3 hours. At the same rate, how many additional hours would it take to travel an additional 180 miles?
train