Two cars, A and B, drive from opposite directions at the same time. Three hours later, the two cars met. The distance between the two places is 174 kilometers. Car A travels 30 kilometers per hour, how many kilometers per hour does Car B travel?
甲乙两辆汽车同时从两地相向开出．3小时后两车相遇．两地相距174千米．甲车每小时行30千米，乙车每小时行多少千米？
<gadget id="calculator">174 / 3</gadget>
<output>58</output>

<gadget id="calculator">58 - 30</gadget>
<output>28</output>

<result>28</result>