The scale of Beijing Metro Planning Map is 1:500000. The length of Metro Line 1 in the picture is about 10cm. What is its actual length?
北京市地铁规划图的比例尺是1：500000．地铁1号线在图中的长度大约是10cm，它的实际长度大约是多少？
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">10 / (1/500_000) / 100_000</gadget>
<output>50</output>

<result>50</result>