Sarah and Jackie decided to share the driving on their trip to north Florida. Sarah started driving at

mile marker 414 and an hour and a half later she

stopped at mile marker 519 and Jackie started driving.

Two hours later they stop for lunch at mile marker 669.

Who had the highest rate of change and what was their

average rate of speed?

A. Sarah had the highest rate of speed of 75 mph.

B. Jackie had the highest rate of speed of 70 mph.

C. Jackie had the highest rate of speed of 75 mph.

D. Sarah has the highest rate of speed of 70 mph.