A and B start from the same place at the same time in the same direction and race along the circular track. A runs 320 meters per minute, and B runs 295 meters per minute. After 16 minutes, A catches up with B. How long is the circular runway in meters?
甲乙两人从同一地点同时同向出发，沿环形跑道赛跑．甲每分跑320米，乙每分跑295米，16分钟后甲追上了乙．环形跑道长多少米？
<gadget id="calculator">320 - 295</gadget>
<output>25</output>

<gadget id="calculator">16 * 25</gadget>
<output>400</output>

<result>400</result>