On the drawing with a scale of 5:1, the measured length of the part is 2.5 cm. What is the actual length of the part?
在比例尺是5：1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">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">2.5 / 5</gadget>
<output>0.5</output>

<result>0.5</result>