On a map with a scale of 1:3000000, the distance between A and B is 2.4 cm. On a map with a scale of 1:4000000, what is the distance in centimeters between A and B?
在比例尺是1：3000000的地图上，量得A、B两城之间的距离是2.4厘米．在一幅比例尺是1：4000000的地图上，A、B两城之间的距离是多少厘米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">2.4 / (1/3_000_000)</gadget>
<output>7_200_000</output>

<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">7_200_000 * (1/4_000_000)</gadget>
<output>9/5 = around 1.8</output>

<result>9/5 = around 1.8</result>