On a map with a scale of 1:1000000, the distance between the two places is measured to be 30 cm. What is the actual distance in kilometers?
在比例尺1：1000000的一幅地图上，量得两地距离是30厘米，它们的实际距离是多少千米．
<gadget id="calculator">1 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

<gadget id="calculator">30 / (1/1_000_000) / 100_000</gadget>
<output>300</output>

<result>300</result>