On a map of China with a scale of 1:4,000,000, the measured distance from Beijing to Lanzhou is 29.5 centimeters. What is the actual distance from Beijing to Lanzhou in kilometers?
在一幅比例尺是1：4000000的中国地图上，量得北京到兰州的距离是29.5厘米，北京到兰州的实际距离是多少千米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">29.5 / (1/4_000_000) / 100_000</gadget>
<output>1_180</output>

<result>1_180</result>