On a map with a scale of 1:20000, the distance between A and B is 5 cm. What is the actual distance in kilometers between A and B?
在比例尺是1：20000的地图上，量得甲、乙两地相距5厘米，甲、乙两地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">5 / (1/20_000)</gadget>
<output>100_000</output>

<gadget id="calculator">100_000 / 100_000</gadget>
<output>1</output>

<result>1</result>