The distance between A and B measured on a map with a scale of 1:300000 is 9 cm, so how many kilometers is the actual distance between A and B?
在一个比例尺为1：300000地图上量的A、B两地的距离是9厘米，那么A、B两地的实际距离是多少千米．
<gadget id="calculator">1 / 300_000</gadget>
<output>1/300_000 = around 0.000003</output>

<gadget id="calculator">9 / (1/300_000) / 100_000</gadget>
<output>27</output>

<result>27</result>