On a map with a scale of 1:5000, the distance between A and B is 4 cm. If it is drawn on a map with a scale of 1:20000, how many centimeters should it be drawn?
在比例尺是1：5000的地图上，量得甲、乙两地的距离是4厘米，如果把它画在比例尺是1：20000的地图上，应画多少厘米？
<gadget id="calculator">1 / 5_000</gadget>
<output>1/5_000 = around 0.0002</output>

<gadget id="calculator">4 / (1/5_000)</gadget>
<output>20_000</output>

<gadget id="calculator">1 / 20_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">20_000 * (1/20_000)</gadget>
<output>1</output>

<result>1</result>