On a 1:500000 map, the distance between A and B is 32 centimeters. Two cars, A and B, are driving opposite each other from A and B at the same time. Car A travels 38 kilometers per hour, and Car B travels per hour 42 kilometers, how many hours after the two cars meet?
在1：500000的地图上量得A、B两地间的距离是32厘米，甲乙两车同时分别从A、B两地相对而行，甲车每小时行38千米，乙车每小时行42千米，开出后几小时两车相遇？
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">38 + 42</gadget>
<output>80</output>

<gadget id="calculator">32 / (1/500_000) / 100_000 / 80</gadget>
<output>2</output>

<result>2</result>