On a map with a scale of 1:6,000,000, the distance between A and B is 15 cm. Cars A and B are traveling towards each other at the same time. Car A travels 55 kilometers per hour, and car B travels 45 kilometers per hour. How many hours later will the two cars meet?
在比例尺1：6000000的地图上，量得A、B两地的距离是15厘米，甲、乙两车同时从两地相向而行．甲车每小时行55千米，乙车每小时行45千米，几小时后两车相遇？
<gadget id="calculator">55 + 45</gadget>
<output>100</output>

<gadget id="calculator">90_000_000 / 100_000 / 100</gadget>
<output>9</output>

<result>9</result>