Two cars drive from two cities that are 450 kilometers apart at the same time. After driving for 3 hours, the distance between the two cars is still 30 kilometers. Car A travels 75 kilometers per hour. How many kilometers does car B travel per hour?
两辆汽车同时从相距450千米的两城相对开出，行了3小时，两车还相距30千米，甲车每小时行75千米，乙车每小时行多少千米？
<gadget id="calculator">450 - 30</gadget>
<output>420</output>

<gadget id="calculator">420 / 3</gadget>
<output>140</output>

<gadget id="calculator">140 - 75</gadget>
<output>65</output>

<result>65</result>