On a map of China with a scale of 1:4,000,000, Wang Gang measured the distance between A and B to be 20cm. If it is drawn on a map with a scale of 1:1,000,000, what is the distance in cm between A and B?
王刚在比例尺是1：4000000的中国地图上，量得甲、乙两地相距20cm，如果画在比例尺是1：1000000的地图上，甲、乙两地图上距离是多少cm？
<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 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

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

<result>80</result>