On a school plan with a scale of 1:2000, a runway is measured to be 4 cm long. What is the actual length of this runway in meters?
在一幅比例尺是1：2000的学校平面图上，量得一条跑道长4厘米，这条跑道实际长是多少米．
<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>