Eustace drives 20.0 km to the east when he realizes he left his wallet at home. He drives 20.0 km west to his house, takes 5.0 min to find his wal- let, then leaves again. Eustace is 40.0 km east of his house exactly 60.0 min after he left the first time. a. What is his average velocity? b. What is his average speed?
