watch part is 2.5cm long on the drawing according to 10:1. What is the actual length of this part?
一种手表零件，按10：1画在图纸上长是2.5cm，这个零件的实际长度是多少？
<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">2.5 / 10</gadget>
<output>0.25</output>

<result>0.25</result>