On a 1:4000000 map, the distance between A and B is 3.5 centimeters. What is the actual distance in kilometers between the two places?
在一幅1：4000000的地图上量得甲乙两地的距离是3.5厘米，两地的实际距离是多少千米．
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">3.5 / (1/4_000_000) / 100_000</gadget>
<output>140</output>

<result>140</result>