On a 1:3000000 map, the distance between A and B is 6 cm. If it is drawn on a 1:4000000 map, how many centimeters are there between A and B?
在1：3000000的地图上，甲乙两地相距6厘米，如果画在1：4000000的地图上，甲乙两地相距多少厘米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">6 / (1/3_000_000)</gadget>
<output>18_000_000</output>

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

<gadget id="calculator">18_000_000 * (1/4_000_000)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>