On a 1:3000000 map, the distance between A and B is 2.5 cm. What is the actual distance in kilometers between the two places?
在一幅1：3000000的地图上量的甲乙两地相距2.5厘米，两地实际的距离是多少千米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">2.5 / (1/3_000_000) / 100_000</gadget>
<output>75</output>

<result>75</result>