Suppose the following assumptions:

Seven cars in the caravan
A tollbooth services a car at a rate of one car every 12 seconds,
Propagation speed of 100 km/hour
Distance between any of two adjacent toll booths is 100 km
Whenever the first car of the caravan arrives at a tollbooth, it waits at the entrance until all the other cars have arrived and lined up behind it.
(3 pt.) Calculate the service delay for the caravan at a tool booth (i. e., per-booth service delay)
(3 pt.) Calculate the propagation delay between two tool booths
(4 pt.) Total delay beginning in front of one tollbooth, passing through an intermediate tollbooth, and finishing just before a third tollbooth.