The circumference of a circular runway is 500 meters. A and B start running clockwise along the circular runway at the same time and on the same ground. A runs 60 meters per minute, and B runs 50 meters per minute. Stop and rest for 1 minute. How many minutes does it take for A to catch up with B for the first time?
环形跑道周长是500米，甲、乙两人按顺时针沿环形跑道同时、同地起跑，甲每分钟跑60米，乙每分钟跑50米，甲、乙两人每跑200米均要停下休息1分钟．那么甲首次追上乙需多少分钟．
<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<gadget id="calculator">500 / 10</gadget>
<output>50</output>

<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">65 + 10 + 2</gadget>
<output>77</output>

<result>77</result>