The distance between the two places is 457 kilometers. Cars A and B drive from opposite places at the same time. After driving for 5 hours, they are still 57 kilometers away from meeting each other. It is known that car A travels 38 kilometers per hour, how many kilometers per hour does car B travel?
两地相距457千米，甲乙两车同时从两地相对开出，行了5小时后，还差57千米相遇．已知甲车每小时行38千米，乙车每小时行多少千米？
<gadget id="calculator">457 - 57</gadget>
<output>400</output>

<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<gadget id="calculator">80 - 38</gadget>
<output>42</output>

<result>42</result>