Draw the actual distance of 9 kilometers on a map with a scale of 1:200000, what is the distance in centimeters on the map.
把实际9千米的距离画到比例尺为1：200000的地图上，图上距离是多少厘米．
<gadget id="calculator">1 / 200_000</gadget>
<output>1/200_000 = around 0.000005</output>

<gadget id="calculator">9 * 100_000 * (1/200_000)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>