X + 9
Dr. John left New Orleans at 12 noon. His drummer left at 1:00 traveling 9 mph faster. If the drummer passed Dr. John at 6:00, what was the average speed of each?
The problem is over when the drummer passes Dr. John at 6 PM, so how long has Dr. John been driving?
How long has the drummer been driving?
What is our picture?
Drummer passing Dr. John
5(x + 9)
5x + 45