An automobile travels along a straight, level highway in two successive segments. In the first segment it covers 40km at a constant speed of 60km h−1. In the second segment it covers another 20km at a constant speed of 40km h−1 in the same direction.
a. (a) Calculate the total time taken for the entire trip.
b. (b) Determine the average speed of the automobile for the whole journey.
c. (c) Find the average velocity for the entire motion.