On the school floor plan with a scale of 1:500, the distance from the student dormitory to the teaching building is 18 cm. What is the actual distance from the student dormitory to the teaching building?
在比例尺1：500的学校平面布局图上，学生宿舍到教学楼的距离是18厘米．学生宿舍到教学楼的实际距离是多少米．
<gadget id="calculator">1 / 500</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">18 / (1/500)</gadget>
<output>9_000</output>

<gadget id="calculator">9_000 / 100</gadget>
<output>90</output>

<result>90</result>