Two cars A and B are traveling toward each other from two places 270 kilometers apart at the same time, and meet each other after 3 hours. It is known that car A travels 50 kilometers per hour, how many kilometers per hour does car B travel?
甲乙两辆汽车同时从相距270千米的两地相向而行，3小时后相遇，己知甲车每小时行50千米，乙车每小时行多少千米？
<gadget id="calculator">270 / 3</gadget>
<output>90</output>

<gadget id="calculator">90 - 50</gadget>
<output>40</output>

<result>40</result>