If the distance between the two places is 6 cm measured on a map with a scale of 1:40000, what is the actual distance in kilometers between the two places?
在比例尺是1：40000的地图上量得两地的距离是6厘米，则这两地间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">6 / (1/40_000) / 100_000</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>