On a map with a scale of 1:5,000,000, the distance between A and B is 6 cm. If two cars A and B drive towards each other at the same time, A will travel 84 kilometers per hour, and B will travel 36 kilometers per hour. Kilometers, how many hours will the two cars meet?
在比例尺1：5000000的地图上，量得AB两地的距离是6厘米，如果甲、乙两辆车同时从两地相向而行，甲车每小时行84千米，乙车每小时行36千米，几小时两车相遇？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">84 + 36</gadget>
<output>120</output>

<gadget id="calculator">6 / (1/5_000_000) / 100_000 / 120</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>