Cars A and B are traveling toward each other at the same time from two places 510 kilometers apart. Car A travels 49.6 kilometers per hour, which is 0.8 kilometers per hour slower than car B. After how many hours do the two cars meet?
甲乙两车同时从相距510千米的两地相向而行，甲车每小时行49.6千米，比乙车每小时慢0.8千米，经过几小时两车相遇？
<gadget id="calculator">49.6 + 0.8</gadget>
<output>50.4</output>

<gadget id="calculator">49.6 + 50.4</gadget>
<output>100</output>

<gadget id="calculator">510 / 100</gadget>
<output>51/10 = around 5.1</output>

<result>51/10 = around 5.1</result>