Help with this problem velocity

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SUMMARY

The discussion centers on calculating the average velocity of a prototype hybrid vehicle driven by an automotive test driver. The driver travels north at 30 mi/h for 2 hours, covering 60 miles, then reverses direction and travels south at 60 mi/h for 1 hour, covering 60 miles. The net displacement is zero miles from the starting position, resulting in an average velocity of zero mi/h. The distinction between average velocity and average speed is emphasized, highlighting the importance of direction in velocity calculations.

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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
 
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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?
 

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