The scale on a map is 1:3,000,000. The distance from Chengdu to Chongqing is measured on this map as 12 centimeters. What is the actual distance from Chengdu to Chongqing in kilometers?
在一张地图上比例尺是1：3000000，在这张地图上量得成都到重庆的距离为12厘米，成都到重庆的实际距离是多少千米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">12 / (1/3_000_000) / 100_000</gadget>
<output>360</output>

<result>360</result>