On a map of China with a scale of 1:15000000, the distance between Beijing and Nanjing is measured to be 6 centimeters, so how many kilometers is the actual distance between Beijing and Nanjing?
在比例尺是1：15000000的中国地图上，量得北京到南京的距离是6厘米，则北京到南京的实际距离大约是多少千米．
<gadget id="calculator">1 / 15_000_000</gadget>
<output>1/15_000_000 = around 0</output>

<gadget id="calculator">6 / (1/15_000_000) / 100_000</gadget>
<output>900</output>

<result>900</result>