Review the car-caravan analogy

Review the car-caravan analogy in Section 1.4. Assume a propagation speed of 100 km/hour
a.Suppose the caravan travels 200 km, beginning in front of one tollbooth,passing through a second tollbooth, and finishing just after a third toll-booth. What is the end-to-end delay?
b. Repeat(a), now assuming that there are eight cars in the caravan instead of ten.