On a map with a scale of 1:1,000,000, the distance between A and B is 21 centimeters. Two passenger cars depart from A and B at the same time. A travels 55 kilometers per hour, and B travels per hour. Travel 65 kilometers, meet in a few hours?
在比例尺是1：1000000的地图上，量得甲地到乙两的距离为21厘米，两辆客车同时从甲、乙两地相对开出、甲车每小时行55千米，乙车每小时行65千米，几小时后相遇？
<gadget id="calculator">1 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

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

<gadget id="calculator">21 / (1/1_000_000) / 100_000 / 120</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>