It is about 320 kilometers from Nanjing to Shanghai, drawn on a 1:4,000,000 map, what is the distance in centimeters on the map between the two places?
南京到上海约320千米，画在1：4000000的地图上，两地间的图上距离是多少厘米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">320 * 100_000 * (1/4_000_000)</gadget>
<output>8</output>

<result>8</result>