Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
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?

### Response:
Travel rate (miles per hour) = 270 miles / 3 hours = <<270/3=90>>90 miles/hour
Additional travel rate (miles per hour) = 90 miles/hour
180 miles / additional travel rate = <<180/(90)=2>>2 additional hours
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