On a map, use 5 centimeters to represent the actual distance of 3 kilometers, what is the scale of this map
在一幅地图上，用5厘米表示实际距离3千米，这副地图的比例尺是多少
<gadget id="calculator">5 / 300_000</gadget>
<output>1/60_000 = around 0.000017</output>

<result>1/60_000 = around 0.000017</result>