<human>:  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?
<bot>: How fast does the train travel? ** The rate is 270/3=<<270/3=90>>90 mph.
How many hours would it take to travel an additional 180 miles? ** Then it takes an additional 180/90=<<180/90=2>>2 hours.
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