16. (6 points) Two cars, A and B, start from two cities, A and B, which are 330 kilometers apart, and drive towards each other. Car A starts from city A, and after some time, car B starts from city B. The speed of car A is $\frac{5}{6}$ of the speed of car B. When the two cars meet, car A has traveled 30 kilometers more than car B. How many kilometers did car A travel before car B started?
【Solution】Solution: When they meet, car B has traveled: $(330-30) \div 2=150$ (km); car A has traveled: $330-150=180$ (km);

When car B starts, car A has traveled:
$$
\begin{array}{l}
180-150 \times \frac{5}{6} \\
=180-125, \\
=55 \text { (km); }
\end{array}
$$

Answer: Car A has traveled 55 km before car B starts.
Therefore, the answer is: 55.