On a map with a scale of 1:600,000, the distance between Chengdu and Mianyang is 20 centimeters. What is the actual distance between Chengdu and Mianyang in kilometers?
在比例尺1：600000的地图上，早得成都和绵阳两地的距离为20厘米，成都与绵阳的实际距离约为多少千米．
<gadget id="calculator">20 / 100_000</gadget>
<output>1/5_000 = around 0.0002</output>

<gadget id="calculator">600_000 * (1/5_000)</gadget>
<output>120</output>

<result>120</result>