On a map with a scale of 1:15,000,000, the distance between Siziwang Banner and Beijing is 3 cm. Then, on a map with a scale of 1:5,000,000, what is the distance in centimeters between the two places?
在比例尺是1：15000000的地图上，量得四子王旗与北京的距离是3厘米，那么在比例尺是1：5000000的地图上，这两地的图上距离是多少厘米．
<gadget id="calculator">1 / 15_000_000</gadget>
<output>1/15_000_000 = around 0</output>

<gadget id="calculator">3 / (1/15_000_000)</gadget>
<output>45_000_000</output>

<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">45_000_000 * (1/5_000_000)</gadget>
<output>9</output>

<result>9</result>