and B walk in opposite directions along a circular runway at the same time (A is fast and B is slow). B walks 75 meters per minute. After 12 minutes, the two meet at a distance of 60 meters from the midpoint. How long is the runway in meters? ?
甲乙二人同时沿着一个圆形跑道向相反的方向走(甲快乙慢)，乙每分钟走75米，经过12分钟后在离中点60米处两个人相遇，这条跑道长多少米？
<gadget id="calculator">75 * 12</gadget>
<output>900</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">900 + 120 + 900</gadget>
<output>1_920</output>

<result>1_920</result>