On a map with a scale of (1/5000000), the distance from Beijing to Shanghai is 21 centimeters. How many kilometers is the actual distance?
在比例尺是(1/5000000)的地图上量得北京到上海的距离是21厘米，实际距离是多少千米？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">21 / (1/5_000_000) / 100_000</gadget>
<output>1_050</output>

<result>1_050</result>