On a map with a scale of 1:1000000, the distance between the two places is 20cm. If it is on a map with a scale of 1:5000000, how many centimeters is the distance between the two places?
在比例尺是1：1000000的地图上，量得两地的距离是20cm，如果在比例尺是1：5000000的地图上，两地间的距离是多少厘米？
<gadget id="calculator">1 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

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

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

<gadget id="calculator">20_000_000 * (1/5_000_000)</gadget>
<output>4</output>

<result>4</result>