On a map with a scale of 1:4,000,000, the distance between Nanjing and Shanghai is 6.5 centimeters. On another map marked with a scale of 1:2500000, what is the distance in centimeters between the two cities?
在一幅比例尺是1：4000000的地图上，量得南京、上海两城市之间的距离是6.5厘米．在另一幅标有比例尺1：2500000的地图上，两城市之间的距离是多少厘米？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">6.5 / (1/4_000_000)</gadget>
<output>26_000_000</output>

<gadget id="calculator">1 / 2_500_000</gadget>
<output>1/2_500_000 = around 0</output>

<gadget id="calculator">26_000_000 * (1/2_500_000)</gadget>
<output>52/5 = around 10.4</output>

<result>52/5 = around 10.4</result>