The distance between A and B is 216 kilometers. Two cars A and B drive from the two places at the same time. They meet each other in 2.4 hours. Car A travels 42 kilometers per hour. How many kilometers does car B travel per hour?
A、B两地相距216千米，甲乙两辆汽车同时从两地相对开出，2.4小时相遇，甲车每小时行42千米，乙车每小时行多少千米？
<gadget id="calculator">216 / 2.4</gadget>
<output>90</output>

<gadget id="calculator">90 - 42</gadget>
<output>48</output>

<result>48</result>