On a map with a scale of 1:2000000, the distance between A and B is 3.5 cm. What is the distance in miles between A and B?
在一幅比例尺是1：2000000的地图上，量得A、B两个城市之间的距离是3.5厘米．A、B两城之间的距离是多少千米．
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">3.5 / (1/2_000_000) / 100_000</gadget>
<output>70</output>

<result>70</result>