On a map with a scale of 1:2000000, the distance between City A and City B is measured to be 2 cm. What is the actual distance between City A and City B?
在比例尺是1：2000000的地图上，量得甲城到乙城的距离是2厘米，甲城到乙城的实际距离是多少
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">2 / (1/2_000_000) / 100_000</gadget>
<output>40</output>

<result>40</result>