On a map with a scale of 1:3,000,000, the distance from Chengdu to Beijing is 4.8 centimeters. How many kilometers is the actual distance from Chengdu to Beijing?
在一幅比例尺是1：3000000的地图上，量得成都到北京的距离是4.8厘米，成都到北京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">4.8 / (1/3_000_000) / 100_000</gadget>
<output>144</output>

<result>144</result>