On a map with a scale of 1:20000, what is the actual distance in kilometers represented by 10 centimeters?
在比例尺是1：20000的地图上，10厘米表示的实际距离是多少千米．
<gadget id="calculator">1 / 20_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">10 / (1/20_000) / 100_000</gadget>
<output>2</output>

<result>2</result>