On a map with a scale of 1:2000000, the length of A and B is 8 cm. On a map with a scale of 1:4000000, what is the distance in centimeters between these two places?
在一副比例尺是1：2000000的地图上，量得A、B两地长8厘米．如果在比例尺是1：4000000的地图上，这两地的距离是多少厘米？
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">8 / (1/2_000_000)</gadget>
<output>16_000_000</output>

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

<gadget id="calculator">16_000_000 * (1/4_000_000)</gadget>
<output>4</output>

<result>4</result>