On a map with a scale of 1:1,000,000, the distance between A and B is 22cm. If two trains of passenger cars A and B depart from A and B at the same time, A travels 50km per hour, which is 10km slower than B per hour. Hours later they meet?
在比例尺1：1000000的地图上，量得A、B两地的距离是22cm，如果甲乙两列客车同时从A、B地相对开出，甲每小时行50km，比乙每小时慢10km，几小时后它们相遇？
<gadget id="calculator">1 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

<gadget id="calculator">50 + 10 + 50</gadget>
<output>110</output>

<gadget id="calculator">22 / (1/1_000_000) / 100_000 / 110</gadget>
<output>2</output>

<result>2</result>