On a map with a scale of 1:3000000, the distance between A and B is 7.5 cm. How many kilometers is the actual distance between A and B?
在一幅比例尺是1：3000000的地图上，甲乙两地的距离是7.5厘米，甲乙两地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">7.5 / (1/3_000_000) / 100_000</gadget>
<output>225</output>

<result>225</result>