On a map with a scale of 1:5,000,000, the measured distance from Nanjing to Beijing is 18 cm. What is the distance from Nanjing to Beijing?
在比例尺是1：5000000的地图上，测得南京到北京的距离是18厘米，南京到北京的距离是多少．
<gadget id="calculator">90_000_000 / 100_000</gadget>
<output>900</output>

<result>900</result>