A map uses 5 centimeters to represent 30 kilometers, what is its scale
一幅地图用5厘米表示30千米，它的比例尺是多少
<gadget id="calculator">30 * 100_000</gadget>
<output>3_000_000</output>

<gadget id="calculator">5 / 3_000_000</gadget>
<output>1/600_000 = around 0.000002</output>

<result>1/600_000 = around 0.000002</result>