Xiao Ming and Xiao Lin are walking towards each other at two places 1200 meters apart at the same time. Xiao Ming runs 320 meters per minute, and Xiao Lin runs 280 meters per minute. How many minutes?
小明和小林在相距1200米的两地同时相向而行，小明每分钟跑320米，小林每分钟280米，当两人分别跑到对方的出发地后立即返回，再次相遇时，两人刚好跑了几分钟？
<gadget id="calculator">1_200 * 2</gadget>
<output>2_400</output>

<gadget id="calculator">320 + 280</gadget>
<output>600</output>

<gadget id="calculator">2_400 / 600</gadget>
<output>4</output>

<result>4</result>