On a map with a scale of 1:5000000, the measured distance from A to B is 3.4 cm. What is the actual distance in miles from A to B?
在比例尺是1：5000000的地图上，量得甲地到乙地的距离是3.4厘米．甲地到乙地的实际距离是多少千米？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">1_000 * 100</gadget>
<output>100_000</output>

<gadget id="calculator">3.4 / (1/5_000_000) / 100_000</gadget>
<output>170</output>

<result>170</result>