Xiaolan and Xiaofang walk in opposite directions from one point on the circular runway at the same time, Xiaolan walks 65 meters per minute, Xiaofang walks 75 meters per minute, and meet after 2.5 minutes. What is the total length of this circular runway?
小兰和小芳同时从环形跑道上的一点向相反方向走去，小兰每分走65米，小芳每分走75米，经过2.5分相遇．这个环形跑道全长是多少米？
<gadget id="calculator">65 + 75</gadget>
<output>140</output>

<gadget id="calculator">140 * 2.5</gadget>
<output>350</output>

<result>350</result>