On a map with a scale of 1:200000, the distance between A and B is 9 cm. What is the actual distance in miles between A and B?
在一幅比例尺为1：200000的地图上，量得甲、乙两地之间的距离是9厘米．甲、乙两地之间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">9 / (1/200_000) / 100_000</gadget>
<output>18</output>

<result>18</result>