On a 1:4000000 map, the distance between A and B is 20 cm. On another map with a scale of 1:5000000, how many centimeters are there between A and B?
在1：4000000的地图上，甲、乙两地相距20厘米，在另一幅比例尺是1：5000000的地图上甲、乙两地相距多少厘米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">20 / (1/4_000_000)</gadget>
<output>80_000_000</output>

<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">80_000_000 * (1/5_000_000)</gadget>
<output>16</output>

<result>16</result>