On a map with a scale of 1:500000, the distance between A and B is 6 cm. What is the actual distance in kilometers between these two places?
在比例尺是1：500000的地图上，量得甲、乙两地之间的距离是6厘米，这两地之间的实际距离是多少千米．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">6 / (1/500_000) / 100_000</gadget>
<output>30</output>

<result>30</result>