The distance from Huangmei to Wuhan is 160km, so what is the distance in cm between Wuhan and Huangmei on a map with a scale of 1:400000.
从黄梅到武汉的距离为160km，那么在比例尺为1：400000的地图上武汉与黄梅的距离为多少cm．
<gadget id="calculator">1 / 400_000</gadget>
<output>1/400_000 = around 0.000002</output>

<gadget id="calculator">160 * 100_000 * (1/400_000)</gadget>
<output>40</output>

<result>40</result>