On the map with a scale of 1:3500000, the distance from Lingling to Dao County is 2 cm. How many kilometers is the actual distance from Lingling to Dao County?
在比例尺为1：3500000的图上量得零陵到道县的距离是2厘米，零陵到道县实际相距多少千米．
<gadget id="calculator">1 / 3_500_000</gadget>
<output>1/3_500_000 = around 0</output>

<gadget id="calculator">2 / (1/3_500_000) / 100_000</gadget>
<output>70</output>

<result>70</result>