On a map with a scale of 1:6,000,000, the distance from Nanjing to Beijing is 15 centimeters. How many kilometers is the actual distance from Nanjing to Beijing?
在比例尺1：6000000的地图上，量得南京到北京的距离是15厘米．南京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">15 / (1/6_000_000) / 100_000</gadget>
<output>900</output>

<result>900</result>