### Instruction: Dave rode 30 miles at 10 miles per hour and 10 miles at 30 miles per hour. What was his average speed, in miles per hour, for the entire ride?### Response: To find the average speed, I need to divide the total distance by the total time.
The total distance is 30 + 10 = 40 miles.
The time for the first part of the ride is 30 / 10 = 3 hours.
The time for the second part of the ride is 10 / 30 = 1/3 hour.
The total time is 3 + 1/3 = 10/3 hours.