On a map with a scale of 1:3000000, the distance between AB and AB on the map is 3.5 cm. What is the actual distance between AB and AB in kilometers?
在比例尺1：3000000的地图上，量得AB两地的图上距离是3.5厘米，则AB两地的实际距离是多少千米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">3.5 / (1/3_000_000) / 100_000</gadget>
<output>105</output>

<result>105</result>