Q$8.$ There are seven cars in a car$-$caravan. It takes $10$ seconds for each tollbooth to

service a car. Assume a propagation speed of $100$ km$/$hour$.$

Suppose the caravan travels $200$ km$,$ beginning in front of one tollbooth $($Before

first tollbooth$),$ passing through a second tollbooth, and finishing just before a third

tollbooth. What is the end$-$to$-$end delay?

$($Tollbooths are $100$ km apart, and the cars propagate at $100$ km$/$hr$.$ A tollbooth

services a car at a rate of one car every $10$ seconds.$)$

From all the options given below, choose the most relevant answer according to

you.

A$.122$ minutes and $20$ seconds

B$.123$ minutes and $30$ seconds

C$.842$ minutes and $20$ seconds

D$.843$ minutes and $30$ seconds