A and B run in opposite directions around a circular track at a uniform speed. Their starting points are at the two ends of the diameter. If they start at the same time, they meet for the first time when B finishes running 100 meters. A runs When the lap was still 60 meters away, they met for the second time. How long is the runway in meters?
甲、乙两人以均匀的速度绕圆形跑道按相反的方向跑步，他们的出发点分别在直径的两个端点，如果他们同时出发，那么在乙跑完100米时第一次相遇，甲跑一圈还差60米时，第二次相遇．跑道的长是几米？
<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<gadget id="calculator">200 - 60</gadget>
<output>140</output>

<gadget id="calculator">100 + 140</gadget>
<output>240</output>

<gadget id="calculator">1.5 - 1</gadget>
<output>0.5</output>

<gadget id="calculator">240 / 0.5</gadget>
<output>480</output>

<result>480</result>