1. Consider the car-caravan analogy from Section 4 in Chapter 1. In this problem, assume a propagation speed of 60 km/hr and that each toll booth takes 6 seconds to service a car.

a) (7 points) Suppose the caravan of 10 cars begins immediately in front of the first toll booth, travels 20 km to a second toll booth, then another 40 km to a third toll booth, and finally stops immediately after the third tool booth. Thus, they travel a total of 60 km. What is the total end-to-end delay?

b) (3 points) Where is the last car in the caravan after 45 minutes? Your answer must include a distance/specific location, and not only a relative direction.