Two trains depart opposite each other from two places 510 kilometers apart. Car A travels 108.8 kilometers per hour, and train B travels 61.2 kilometers per hour. After how many hours do the two trains meet on the way?
两列火车从相距510千米的两地相对开出，甲车每小时行108.8千米，乙车每小时行61.2千米，经过多少小时两车在途中相遇？
<gadget id="calculator">108.8 + 61.2</gadget>
<output>170</output>

<gadget id="calculator">510 / 170</gadget>
<output>3</output>

<result>3</result>