On a map with a scale of 1:3000000, the measured distance between A and B is 50 cm. If two trains of passenger cars A and B depart from places A and B at the same time, passenger car A travels 76 kilometers per hour, and passenger car B travels 74 kilometers per hour. After how many hours do they meet?
在比例尺是1：3000000的地图上，量的A、B两地的距离是50厘米．如果甲、乙两列客车同时从A、B两地相对开出，甲客车每小时行76千米，乙客车每小时行74千米，经过几小时相遇？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">76 + 74</gadget>
<output>150</output>

<gadget id="calculator">50 / (1/3_000_000) / 100_000 / 150</gadget>
<output>10</output>

<result>10</result>