Car A and car B drive oppositely from two places 135 kilometers apart at the same time, and they meet after 1.5 hours. The speed of car A is 48 kilometers per hour. What is the speed of car B in kilometers per hour? (column equation solution)
甲乙两车同时从相距135千米的两地相对开出，1.5小时后相遇，甲的速度是每小时48千米，求乙车速度是每小时多少千米？(列方程解答)
<gadget id="calculator">48 * 1.5</gadget>
<output>72</output>

<gadget id="calculator">135 - 72</gadget>
<output>63</output>

<gadget id="calculator">63 / 1.5</gadget>
<output>42</output>

<result>42</result>