An average of $12$ cars can be seen in the system$($both the$$ drive$-$through line and the$$ drive$-$through window$)$ at Burger Universe. Approximately every $15$seconds$,$ a car attempts to enter the$$ drive$-$through line;$$ however, $20\%$ of cars simply leave the restaurant because$$ they're discouraged by the length of the line. On$$ average, how long does a car spend going through the$$ drive$-$through at Burger$$ Universe?

Part $2$

On$$ average, the time the car spends going through the$$ drive$-$through at Burger Universe is

$$

enter your response here minutes