Help with this problem velocity

[luckylayla]

A automotive test driver travels due north in a prototype hybrid vehicle at 30 mi/h for 2 hours. She then reverses her direction and travels due south at 60 mi/h for 1 hour.

What is the average velocity of the vehicle?



40 mi/h, south



45 mi/h, north



45 mi/h, south



zero mi/h



40 mi/h, north

 

[HallsofIvy]

Do you know the meaning of "average velocity"? (And, most especially, do you know the difference between that and "average speed"?) How far from the starting position did she wind up? How long did it take her to move there?