On a map with a scale of 1:5000000, the distance between A and B is 20 centimeters. Two cars drive from A and B at the same time. Car A is 60 kilometers per hour, and Car B is 40 kilometers per hour. Kilometers, meet in a few hours?
在比例尺是1：5000000的地图上，量得A、B两地的距离是20厘米，两辆汽车同时从A、B两地相对开出，甲汽车每小时60千米，乙汽车每小时40千米，几小时后相遇？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">20 / (1/5_000_000) / 100_000 / 100</gadget>
<output>10</output>

<result>10</result>