Stan drove 300 miles in 5 hours, 20 minutes. Next, he drove 360 miles in 6 hours, 40 minutes. What was Stan's average speed in miles per hour for the total trip?
I need to find the average speed in miles per hour for the whole trip, so I need to divide the total distance by the total time. The total distance is the sum of the two distances: 300 miles + 360 miles = 660 miles. The total time is the sum of the two times, but I need to convert them to hours first. 5 hours, 20 minutes is 5 + 20/60 hours, which is 5 + 1/3 hours, which is 16/3 hours. 6 hours, 40 minutes is 6 + 40/60 hours, which is 6 + 2/3 hours, which is 20/3 hours. The sum of the times is 16/3 hours + 20/3 hours, which is 36/3 hours, which is 12 hours. So the average speed is 660 miles / 12 hours, which is 55 miles per hour.

