The highway between the two cities is 256 kilometers long. Two cars A and B start from two cities at the same time, drive toward each other, and meet each other after 4 hours. Car A travels 31 kilometers per hour, how many kilometers per hour does Car B travel?
两城之间的公路长256千米．甲乙两辆汽车同时从两个城市出发，相向而行，经过4小时相遇．甲车每小时行31千米，乙车每小时行多少千米？
<gadget id="calculator">256 / 4</gadget>
<output>64</output>

<gadget id="calculator">64 - 31</gadget>
<output>33</output>

<result>33</result>