The distance on the map from a primary school to the Children's Palace is 4.5cm. The ratio on the map is 1:18000. What is the actual distance in m?
某小学到少年宫的图上距离是4.5cm图上的比例为1：18000，则实际距离是多少m．
<gadget id="calculator">1 / 18_000</gadget>
<output>1/18_000 = around 0.000056</output>

<gadget id="calculator">4.5 / (1/18_000) / 100</gadget>
<output>810</output>

<result>810</result>