Two trains leave in the same direction at the same time from two places 570km apart. Car A travels 110 km per hour, and Car B travels 80 km per hour. After how many hours did the two cars meet?
两列火车从相距570km的两地同时同相向开出．甲车每小时行110km，乙车每小时行80km．经过几个小时两车相遇？
<gadget id="calculator">110 + 80</gadget>
<output>190</output>

<gadget id="calculator">570 / 190</gadget>
<output>3</output>

<result>3</result>