Review the car$-$caravan analogy in Section $1\mathrm{.}4.$ Assume a propagation speed of $63$

km$/$hour$.$

a$.$ Suppose the caravan travels $175$km$,$ beginning in front of one tollbooth, passing through

a second tollbooth, and finishing just after a third tollbooth. What is the end$-$to$-$end delay?

b$.$ Repeat $($a$),$ now assuming that there are eight cars in the caravan instead of ten