and B drive in opposite directions from the same place. A starts at 6:00 p.m. and travels 120 kilometers per hour, and B starts at 4:00 a.m. the next day. After 10 hours, the distance between the two cars is 3,800 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120千米米，乙第二天上午4时出发，经过10小时后两车相距3800千米．乙车的时速是多少千米？
<gadget id="calculator">120 * 10</gadget>
<output>1_200</output>

<gadget id="calculator">3_800 - 1_200 - 1_200</gadget>
<output>1_400</output>

<gadget id="calculator">1_400 / 10</gadget>
<output>140</output>

<result>140</result>