The total length of the Beijing-Shanghai Expressway is 1,260 kilometers. Cars A and B set off from Beijing and Shanghai respectively at the same time, head towards each other, and meet each other after 6 hours. The speed of car A is 90 km/h, what is the speed of car B?
京沪高速公路全长1260千米．甲、乙两辆汽车同时分别从北京和上海出发，相向而行，经过6小时相遇．甲车的速度是90千米/时，乙车的速度是多少？
<gadget id="calculator">1_260 / 6</gadget>
<output>210</output>

<gadget id="calculator">210 - 90</gadget>
<output>120</output>

<result>120</result>