On a map with a scale of 1:4000000, the distance between A and B is 30 cm. Two trains depart from A and B at the same time. It is known that car A travels 65 kilometers per hour, and car B travels 55 kilometers per hour. How many hours will it take for the two cars to meet?
在比例尺是1：4000000的地图上量得甲、乙两地的距离是30厘米．两列火车同时从甲、乙两地相对开出．已知甲车每小时行65千米，乙车每小时行55千米，几小时后两车才能相遇？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">65 + 55</gadget>
<output>120</output>

<gadget id="calculator">30 / (1/4_000_000) / 100_000 / 120</gadget>
<output>10</output>

<result>10</result>