CE Predict/Explain you drive your car in a straight line at 15m/s for 10 kilometers, then at 25m/s for another 10 kilometers.

(a) Is your average speed for the entire trip greater than, less than, or equal to 20m/s?

(b) Choose the best explanation from among the following:

I. More time is spent at 15m/s than at 25m/s.

II. The average of 15m/s and 25m/s is 20m/s.

III. Less time is spent at 15m/s than at 25m/s.