16. (15 points) One day, Dad drove Xiaohong to a place 1000 meters away from the school and let her walk the rest of the way. As a result, Xiaohong took 22.5 minutes to get to school that day. If Xiaohong rides a bicycle from home to school, it takes her 40 minutes. She usually walks at a speed of 80 meters per minute, and riding a bicycle is 800 meters per minute slower than Dad driving. Find the distance from Xiaohong's home to the school.
【Solution】Solution: Time taken by the car: $22.5-1000 \div 80=10$ (minutes)
$$
\begin{array}{l}
10 \times 800=8000 \text { (meters) } \\
8000+1000=9000 \text { (meters) } \\
9000 \div(40-10)=300 \text { (meters/minute) } \\
300 \times 40=12000 \text { (meters) }
\end{array}
$$

Answer: The distance from Xiaohong's home to the school is 12000 meters.