Liangliang and Fangfang ran around the school playground from the same point in opposite directions at the same time. Liangliang ran 85 meters per minute, and Fangfang ran 75 meters per minute. They met after 5 minutes. How long is the playground?
亮亮和芳芳从同一点同时围着学校的操场向相反的方向跑，亮亮每分钟跑85米，芳芳每分钟跑75米，5分钟后两人相遇，操场长多少米．
<gadget id="calculator">75 + 85</gadget>
<output>160</output>

<gadget id="calculator">160 * 5</gadget>
<output>800</output>

<result>800</result>