On a map of China with a scale of 1:4,000,000, the distance from Beijing to Guangzhou is measured to be 50 centimeters. How many kilometers is the actual distance from Beijing to Guangzhou?
在比例尺是1：4000000的中国地图上，量得北京到广州的距离是50厘米，北京到广州的实际距离是多少千米？
<gadget id="calculator">200_000_000 / 100_000</gadget>
<output>2_000</output>

<result>2_000</result>