Cars A and B leave opposite stations A and B respectively. They meet for the first time at a distance of 90 kilometers from station A. After the meeting, the two cars continue to move forward at the original speed and return immediately after reaching the destination. The first time they met at a place 50 kilometers away from Station A. Find the distance between A and B.
甲、乙两辆汽车分别从A、B两站相对开出，第一次在离A站90千米处相遇，相遇后两辆车继续以原速度前进，到达目的地后立即返回，第二次在离A站50千米处相遇．求A、B之间距离．
<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">270 + 50</gadget>
<output>320</output>

<gadget id="calculator">320 / 2</gadget>
<output>160</output>

<result>160</result>