On a 1:300000 map, the distance between the two places is 4 cm. What is the actual distance between the two places?
在1：300000的地图上，两地相距4厘米，两地的实际距离是多少．
<gadget id="calculator">1 / 300_000</gadget>
<output>1/300_000 = around 0.000003</output>

<gadget id="calculator">4 / (1/300_000) / 100_000</gadget>
<output>12</output>

<result>12</result>