On a map with a scale of 1:30000000, the distance from Beijing to Shanghai is 3.5 centimeters. What is the actual distance between Beijing and Shanghai?
在一幅比例尺是1：30000000的地图上，量出北京到上海是3.5厘米．北京到上海的实际距离是多少千米？
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">3.5 / (1/30_000_000) / 100_000</gadget>
<output>1_050</output>

<result>1_050</result>