16. A primary school in Shanghai has a circular track that is 300 meters long. Xiao Ya and Xiao Pang start running from the starting line at the same time. Xiao Ya runs 6 meters per second, and Xiao Pang runs 4 meters per second.
(1) How many meters have Xiao Ya and Xiao Pang run when Xiao Ya catches up with Xiao Pang for the first time?
(2) How many laps have Xiao Ya and Xiao Pang run when Xiao Ya catches up with Xiao Pang for the second time?
【Solution】Solution: (1) The time required for the first catch-up is:
$$
\begin{array}{l}
300 \div(6-4), \\
=300 \div 2, \\
=150 \text { (seconds); }
\end{array}
$$

Xiao Ya ran:
$$
6 \times 150=900 \text { (meters); }
$$

Xiao Pang ran:
$$
4 \times 150=600 \text { (meters); }
$$

Answer: When Xiao Ya catches up with Xiao Pang for the first time, Xiao Ya has run 900 meters, and Xiao Pang has run 600 meters.
$$
\begin{array}{l}
\text { (2) Xiao Pang: } \\
600 \div 300 \times 2, \\
=2 \times 2, \\
=4 \text { (laps); }
\end{array}
$$

Xiao Ya:
$$
\begin{array}{l}
900 \div 300 \times 2, \\
=3 \times 2, \\
=6 \text { (laps); }
\end{array}
$$

Answer: When Xiao Ya catches up with Xiao Pang for the second time, Xiao Pang has run 4 laps, and Xiao Ya has run 6 laps.