A and B drive in opposite directions from the same place. A starts at 6:00 p.m. and travels 40,000 meters per hour, and B starts at 4:00 a.m. the next day. After 10 hours, the distance between the two cars is 1,080 kilometers. What is the speed of car B in kilometers per hour?
甲乙从同一地点向相反的方向行驶，甲下午6时出发每小时行40000米，乙第二天上午4时出发，经过10小时后两车相距1080千米．乙车的时速是多少千米？
<gadget id="calculator">40_000 / 1_000</gadget>
<output>40</output>

<gadget id="calculator">40 * 10</gadget>
<output>400</output>

<gadget id="calculator">1_080 - 400 - 400</gadget>
<output>280</output>

<gadget id="calculator">280 / 10</gadget>
<output>28</output>

<result>28</result>