Two trains A and B depart from two cities 1620 kilometers apart at the same time, and meet after 6 hours. It is known that car A travels 140 kilometers per hour, what is the speed of car B in kilometers?
甲、乙两列火车同时从相距1620千米的两城相对开出，经过6小时相遇．已知甲车每小时行140千米，乙车的速度是多少千米？
<gadget id="calculator">1_620 / 6</gadget>
<output>270</output>

<gadget id="calculator">270 - 140</gadget>
<output>130</output>

<result>130</result>