On a map with a scale of 1:6,000,000, the distance between Zhengzhou and Beijing is measured to be 11.5 centimeters. How many kilometers is the actual distance between Zhengzhou and Beijing?
在比例尺是1：6000000的地图上，量得郑州到北京的距离是11.5厘米，郑州到北京的实际距离大约是多少千米？
<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">11.5 / (1/6_000_000) / 100_000</gadget>
<output>690</output>

<result>690</result>