On a map with a scale of 1:4000000, the distance between A and B is 20 cm. Two trains depart from A and B at the same time. A train travels 185 kilometers per hour, and B train travels 215 kilometers per hour. Kilometers, meet in a few hours?
在比例尺是1：4000000的地图上，量得甲、乙两地相距20厘米，两列火车同时从甲、乙两地相对开出、甲车每小时行185千米，乙车每小时行215千米，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">185 + 215</gadget>
<output>400</output>

<gadget id="calculator">20 / (1/4_000_000) / 100_000 / 400</gadget>
<output>2</output>

<result>2</result>