The scale of a drawing of a precision part is 4:1, and the length of the part measured on the drawing is 10 mm. What is the actual length of this part?
一张精密零件图纸的比例尺是4：1，在图纸上量得零件长10毫米．这个零件的实际长度是多少？
<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>