On a map with a scale of 1:2,000,000, the distance between A and B is 20 centimeters. Two trains depart from A and B at the same time. Train A travels 34 kilometers per hour, and train B travels per hour. Traveling 46 kilometers, how many hours will the two cars meet?
在比例尺是1：2000000的地图上，量得A、B两地的距离是20厘米，两列火车同时从A、B两地相对开出，甲车每小时行34千米，乙车每小时行46千米，几小时后两车相遇？
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">1_000 * 100</gadget>
<output>100_000</output>

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

<gadget id="calculator">34 + 46</gadget>
<output>80</output>

<gadget id="calculator">400 / 80</gadget>
<output>5</output>

<result>5</result>