It is known that the actual distance from Tianjin to Nanjing is 1,000 kilometers. On a map with a scale of 1:40,000, measure the distance in centimeters from Tianjin to Nanjing on the map.
已知天津到南京实际距离是1000千米，在比例尺是1：40000的地图上，量得天津到南京图上距离应是多少厘米．
<gadget id="calculator">1 / 40_000</gadget>
<output>1/40_000 = around 0.000025</output>

<gadget id="calculator">1_000 * 100_000 * (1/40_000)</gadget>
<output>2_500</output>

<result>2_500</result>