On a map with a scale of 1:4000000, the distance between A and B is 20cm. Two trains depart from A and B at the same time. A train travels 55km per hour, and the speed of B is that of A (9/11) , How many hours did the two cars meet after driving out?
在比例尺是1：4000000的地图上，量得甲乙两地相距20cm，两列火车同时从甲乙两地相向开出，甲车每小时行55km，乙车的速度是甲车的(9/11)，两车开出后几小时相遇？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">9 / 11</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">55 * (9/11)</gadget>
<output>45</output>

<gadget id="calculator">55 + 45</gadget>
<output>100</output>

<gadget id="calculator">20 / (1/4_000_000) / 100_000 / 100</gadget>
<output>8</output>

<result>8</result>