The distance between the two places is 80 kilometers. How many centimeters should be drawn on a map with a scale of 1:4,000,000?
两地相距80千米，画在比例尺是1：4000000的地图上，应画多少厘米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">80 * 100_000 * (1/4_000_000)</gadget>
<output>2</output>

<result>2</result>