A 400-meter circular runway, A and B start running in the same direction at the same time, A runs 220 meters per minute. B runs 180 times per minute. At least a few minutes later A catches up with B?
一条400米的环形跑道，甲、乙同时同地同向起跑，甲每分钟跑220米．乙每分钟跑180来．至少几分钟后甲追上乙？
<gadget id="calculator">220 - 180</gadget>
<output>40</output>

<gadget id="calculator">400 / 40</gadget>
<output>10</output>

<result>10</result>