Two cars, A and B, leave from Shanghai and Nanjing at the same time. After 3.1 hours, A and B meet at a distance of 12.4 kilometers beyond the midpoint. Car A travels 54 kilometers per hour, how many kilometers per hour does Car B travel?
甲乙两辆汽车同时从上海和南京相对开出，经过3.1小时后，甲车在超过中点12.4千米处和乙车相遇．甲车每小时行54千米，乙车每小时行多少千米？
<gadget id="calculator">3.1 * 54</gadget>
<output>167.4</output>

<gadget id="calculator">167.4 - 12.4</gadget>
<output>155</output>

<gadget id="calculator">155 * 2</gadget>
<output>310</output>

<gadget id="calculator">310 / 3.1</gadget>
<output>100</output>

<gadget id="calculator">100 - 54</gadget>
<output>46</output>

<result>46</result>