A circular runway is 400 meters long. Xiao Ming runs 260 meters per minute, and Xiao Liang runs 210 meters per minute. They both set off in the same direction at the same time. How many minutes did it take for them to meet?
一条环形跑道长400米，小明每分钟跑260米，小亮每分钟跑210米，两人同时同向出发，经过多少分钟两人相遇？
<gadget id="calculator">260 - 210</gadget>
<output>50</output>

<gadget id="calculator">400 / 50</gadget>
<output>8</output>

<result>8</result>