The distance between A and B is 480 km. The distance between the two cities was measured on a map to be 6 cm. On this map, the distance between C and D is 7 cm. What is the actual distance between C and D?
甲、乙两城相距480千米．在一幅地图上量得这两城之间的距离是6厘米．在这幅地图上还量得丙、丁两城的距离是7厘米．丙、丁两城的实际距离是多少？
<gadget id="calculator">480 * 100_000</gadget>
<output>48_000_000</output>

<gadget id="calculator">6 / 48_000_000</gadget>
<output>1/8_000_000 = around 0</output>

<gadget id="calculator">7 / (1/8_000_000) / 100_000</gadget>
<output>560</output>

<result>560</result>