On a map with a scale of 1:500000, the distance between A and B is 11 cm. What is the actual distance between A and B in kilometers?
在比例尺是1：500000的地图上，量得A、B两地间的距离是11厘米，A、B两地间的实际距离是多少千米．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">11 / (1/500_000) / 100_000</gadget>
<output>55</output>

<result>55</result>