On a map with a scale of 1:3,000,000, the distance between highways in cities A and B is 8 cm. On another map with a scale of 1:6,000,000, how many centimeters is the distance on this map?
在一副比例尺为1：3000000的地图上量得甲乙两个城市高速路的距离是8厘米，在另一幅比例尺为1：6000000的地图上，这幅地图的图上距离是多少厘米？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">8 / (1/3_000_000)</gadget>
<output>24_000_000</output>

<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">24_000_000 * (1/6_000_000)</gadget>
<output>4</output>

<result>4</result>