The scale of a design drawing is 1:2000. If the distance on the drawing between two points AB is 4 cm, what is the actual distance between the two points AB in meters?
一张设计图的比例尺是1：2000，量得AB两点间的图上距离是4厘米，则AB两点间的实际距离是多少米．
<gadget id="calculator">1 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

<gadget id="calculator">4 / (1/2_000)</gadget>
<output>8_000</output>

<gadget id="calculator">8_000 / 100</gadget>
<output>80</output>

<result>80</result>