On the drawing with a scale of 1:5, the measured part is 2.5cm long. What is the actual length of this part?
在比例尺是1：5的图纸上，量得零件长2.5cm，这个零件的实际长度是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2.5 / (1/5)</gadget>
<output>12.5</output>

<result>12.5</result>