Cars A and B drive oppositely from two places at the same time. The distance between the two places is 285 kilometers. After 3 hours, the distance between the two cars is 171 kilometers. Car A travels 30 kilometers per hour, how many kilometers per hour does Car B travel?
甲、乙两车同时从两地相对开出，两地相距285千米，3小时后两车相距171千米．甲车每小时行30千米，乙车每小时行多少千米？
<gadget id="calculator">285 - 171</gadget>
<output>114</output>

<gadget id="calculator">114 / 3</gadget>
<output>38</output>

<gadget id="calculator">38 - 30</gadget>
<output>8</output>

<result>8</result>