On a map with a scale of 1:500,000, the distance between A and B is 3.5 cm. How many kilometers is the distance between A and B?
在比例尺是1：500000的地图上，量得甲、乙两地的距离是3.5厘米，甲、乙两地相距多少千米？
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">3.5 / (1/500_000) / 100_000</gadget>
<output>17.5</output>

<result>17.5</result>