On a map with a scale of 1:40000, the distance between A and B is 3.5 cm. What is the actual distance in kilometers between A and B?
在比例尺是1：40000的地图上，量得A、B两地间的距离是3.5厘米，A、B两地的实际距离是多少千米．
<gadget id="calculator">1 / 40_000</gadget>
<output>1/40_000 = around 0.000025</output>

<gadget id="calculator">3.5 / (1/40_000) / 100_000</gadget>
<output>1.4</output>

<result>1.4</result>