The road from Jinan to Qingdao is 256 kilometers long. Cars A and B start from these two cities at the same time, drive towards 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? (solution by equation)
从济南到青岛的公路长256千米，甲、乙两辆汽车同时从这两个城市出发，相向而行，经过4小时相遇．甲汽车每小时行31千米，乙汽车每小时行多少千米？(用方程解)
<gadget id="calculator">31 * 4</gadget>
<output>124</output>

<gadget id="calculator">256 - 124</gadget>
<output>132</output>

<gadget id="calculator">132 / 4</gadget>
<output>33</output>

<result>33</result>