A and B start from two points A and B respectively on a circular runway at the same time, walk toward each other, meet each other after 5 minutes, A arrives at point B after 7 minutes, and two people after 8 minutes after A arrives at point B. The second time we meet, how many minutes does A ring walk around?
甲、乙二人在一圆形跑道上分别从A、B两点同时出发，相向而行，5分钟后相遇，又过7分钟甲到B点，甲到B点后再过8分钟两人第二次相遇，甲环行一圈多少分钟．
<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">5 / 15</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 / (1/3)</gadget>
<output>36</output>

<result>36</result>