16. (15 points) Two cars, A and B, start from points $A$ and $B$ respectively, heading towards each other. The two cars meet after 5 hours, at which point car A has passed the midpoint by 25 kilometers. After meeting, the two cars continue to travel, and 3 hours later, car A reaches point $B$. How many kilometers does car B travel per hour?
【Analysis】From the problem, we know: After meeting, the two cars continue to travel. 3 hours later, car A reaches location $B$, which means that the distance car A travels in 3 hours is the same as the distance car B travels in 5 hours, i.e., the distances are equal. Therefore, the speed ratio of the two cars is $5: 3$. The distance ratio when they meet is also 5: 3, meaning that when they meet, car A has traveled (5-3) parts more than car B. Each part is 25 kilometers. If the entire journey is considered as (5+3) parts, then 25 kilometers is $\frac{1}{8}$ of a part. Thus, the total distance can be calculated using division, and the distance car B has traveled when they meet can be found. The speed can then be calculated using “distance ÷ time = speed”.

【Solution】Solution: $25 \times 2 \div(5-3) \div \frac{1}{5+3}$
$$
\begin{array}{l}
=25 \div \frac{1}{8} \\
=200 \text { (km) } \\
200 \times \frac{3}{5+3}=75 \text { (km) } \\
75 \div 5=15 \text { (km/h) }
\end{array}
$$

Answer: Car B travels 15 kilometers per hour.