On a map with a scale of 1:3,000,000, the distance from Taicheng to Shenzhen is 15 centimeters. How many kilometers is the actual distance from Taicheng to Shenzhen?
在比例尺是1：3000000的地图上，量得台城到深圳的距离是15厘米，台城到深圳的实际距离是多少千米？
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">15 / (1/3_000_000) / 100_000</gadget>
<output>450</output>

<result>450</result>