On a map with a scale of 1:200000, the distance on the map between the two places is 4.5cm. What is the actual distance in kilometers between the two places?
在比例尺为1：200000的地图上量得两地的图上距离为4.5cm，这两地的实际距离是多少千米．
<gadget id="calculator">1 / 200_000</gadget>
<output>1/200_000 = around 0.000005</output>

<gadget id="calculator">4.5 / (1/200_000) / 100_000</gadget>
<output>9</output>

<result>9</result>