On a map with a scale of 1:40000000, the measured distance from A to B is 3.5 cm, so what is the actual distance in kilometers from A to B?
在比例尺1：40000000的地图上，量得A地到B地的距离是3.5厘米，则A地到B地的实际距离是多少千米．
<gadget id="calculator">1 / 40_000_000</gadget>
<output>1/40_000_000 = around 0</output>

<gadget id="calculator">3.5 / (1/40_000_000) / 100_000</gadget>
<output>1_400</output>

<result>1_400</result>