On a map with a scale of 1:250000, the measured distance between A and B is 6 cm. What is the actual distance between A and B in kilometers?
在比例尺是1：250000的地图上，量得甲乙间距离是6厘米，甲乙两地实际距离是多少千米．
<gadget id="calculator">1 / 250_000</gadget>
<output>1/250_000 = around 0.000004</output>

<gadget id="calculator">6 / (1/250_000) / 100_000</gadget>
<output>15</output>

<result>15</result>