An automobile travels on a straight road for 40 km at 30 km/h. It then continues in the same direction for another 40 km at 60 km/h.
a) What is the average velocity of the car during the full 80 km trip? (Assume that it moves in the positive x direction.)
b) What is the average speed?
c) Graph x versus t and indicate how the average velocity is found on the graph.