On a map with a scale of 1:6,000,000, the distance between Shenzhen and Guangzhou is measured as 3 centimeters. What is the actual distance between Shenzhen and Guangzhou in kilometers?
在比例尺1：6000000的地图上，量得深圳和广州两地的距离为3厘米，深圳与广州的实际距离约为多少千米．
<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">3 / (1/6_000_000) / 100_000</gadget>
<output>180</output>

<result>180</result>