Cars A and B drive out from A and B at the same time at different speeds. The first time they meet at a distance of 80 kilometers from A, they return immediately after arriving at each other, and the second time they meet at a distance from B. Meet at 50 kilometers. How many kilometers are the distance between the two places?
甲、乙两辆汽车分别以不同的速度，同时从A、B两相对开出，第一次在离A地80千米处相遇，各自到达对方处后立即返回，第二次在离B地50千米处相遇．两地相距多少千米？
<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<gadget id="calculator">240 - 50</gadget>
<output>190</output>

<result>190</result>