On a map with a scale of 1:4000000, the distance between A and B is 24 cm. Two trains depart from A and B at the same time. A train travels 55 kilometers per hour, which is 10 times slower than B per hour. Kilometers, meet in a few hours?
比例尺是1：4000000的地图上，量得甲、乙两地相距24厘米，两列火车同时从甲、乙两地相对开出，甲车每小时行55千米，比乙车每小时慢10千米，几小时后相遇？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">55 + 10 + 55</gadget>
<output>120</output>

<gadget id="calculator">24 / (1/4_000_000) / 100_000 / 120</gadget>
<output>8</output>

<result>8</result>