A physics instructor drives down to St. Louis to see his mom. On the way there, he travels the first half of the time at 60.0 km/hr and the second half the time at 95.0 km/hr. Coming back, he drives the first half the distance at 60.0 km/hr and the second half of the distance at 95.0 km/hr.
What is his average speed coming back from St. Louis ?
What is his average speed during the entire trip ?
What is his total displacment during the entire trip ?