Assume a propagation speed of 45 km/hr and that each toll booth takes 6 seconds to service a car.

a) 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) Where is the last car in the caravan after one hour? Your answer must include a distance/specific