Lizzy: A car traveled 360 miles in 4 hours and 30 minutes. What was its speed in miles per hour?.
Me: Hmmm, let me think. I think this is the detailed solution:
There are 60 minutes in one hour, so the car traveled 360 miles in 4 hours + 30 minutes / 60 minutes / hour = 4.5 hours. In one hour, the car travels 360 miles / 4.5 hours = 80 miles / hour. Final answer: 80.