On a drawing with a scale of 1:20000, the distance between A and B is 15 cm. Then, on another drawing with a scale of 1:30000, what is the distance in centimeters between the two places?
在比例尺是1：20000的图纸上量得甲乙两地相距15厘米，那么在另一张比例尺是1：30000的图纸上，这两地间的图上距离应是多少厘米．
<gadget id="calculator">1 / 20_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">15 / (1/20_000)</gadget>
<output>300_000</output>

<gadget id="calculator">1 / 30_000</gadget>
<output>1/30_000 = around 0.000033</output>

<gadget id="calculator">300_000 * (1/30_000)</gadget>
<output>10</output>

<result>10</result>