Two cars, A and B, drive from two places 225 kilometers apart at the same time. After 2.5 hours, they meet each other. Car A travels 48 kilometers per hour. How many kilometers does car B travel per hour?
甲、乙两辆汽车同时从相距225千米的两地相对开出，经过2.5小时相遇，甲车每小时行48千米，乙车每小时行多少千米？
<gadget id="calculator">225 / 2.5</gadget>
<output>90</output>

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

<result>42</result>