The distance from A to B is 160 kilometers, how many centimeters should be drawn on the 1:40000000 map.
甲地到乙地的距离是160千米，在1：40000000的地图上应画多少厘米．
<gadget id="calculator">1 / 40_000_000</gadget>
<output>1/40_000_000 = around 0</output>

<gadget id="calculator">160 * 100_000 * (1/40_000_000)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>