On the same map, the distance between A and B is 15cm, and the distance between A and C is 20cm. If the actual distance between A and B is 450km, how many kilometers are the actual distance between A and C?
在同一幅地图上量得A、B两地相距15cm，A、C两地相距20cm．如果A、B两地实际相距450km，那么A、C两地实际相距多少千米？
<gadget id="calculator">20 * 450</gadget>
<output>9_000</output>

<gadget id="calculator">9_000 / 15</gadget>
<output>600</output>

<result>600</result>