Cars A and B depart from the east and west stations at the same time. In the first meeting, car A travels 90 kilometers, the two cars continue to move forward at the same speed, each car returns immediately after arriving at the station, and the second meeting place is 60 kilometers east of the first meeting point. How many kilometers is the distance between the east and west stations?
甲，乙两车分别从东，西两站同时相对开出．第一次相遇，甲车行了90千米，两车继续以原速前进，各车到站后立即返回，第二次相遇地点在第一次相遇点东侧60千米处．求东，西两站相距几千米？
<gadget id="calculator">90 - 60</gadget>
<output>30</output>

<gadget id="calculator">30 + 90</gadget>
<output>120</output>

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

<gadget id="calculator">60 + 90</gadget>
<output>150</output>

<result>150</result>