Lizzy: 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?.
Me: Hmmm, let me think. I think this is the detailed solution:
The rate is 270 / 3 = 90 mph. Then it takes an additional 180 / 90 = 2 hours. Final answer: 2.