On a map with a scale of 1:30000000, the distance between Beijing and Changsha is measured to be 5.1 centimeters. If it is drawn on a map with a scale of 1:25000000, how many centimeters is the distance between the two places on the map?
在比例尺为1：30000000的地图上，量得北京到长沙的距离是5.1厘米，如果把它画在比例尺为1：25000000的地图上，两地的图上距离为多少厘米？
<gadget id="calculator">1 / 30_000_000</gadget>
<output>1/30_000_000 = around 0</output>

<gadget id="calculator">5.1 / (1/30_000_000)</gadget>
<output>153_000_000</output>

<gadget id="calculator">1 / 25_000_000</gadget>
<output>1/25_000_000 = around 0</output>

<gadget id="calculator">153_000_000 * (1/25_000_000)</gadget>
<output>153/25 = around 6.12</output>

<result>153/25 = around 6.12</result>