Problem: A Penn State professor drives from State College to Tyrone, 20 miles away, at 40 mph. He stops for 20 minutes in Tyrone for coffee, then drives on to Altoona (another 20 miles) at 60 mph. Assuming State College, Tyrone and Altoona to be more or less on a straight line,
Part A: What is the magnitude of the professor's average velocity for the entire trip?
I need help to find the magnitude of the professor's average velocity for the entire trip.