On a precision drawing with a scale of 15:1, the length of the part is measured to be 3 cm. What is the actual length of this part in centimeters?
在一张比例尺为15：1的精密图纸上，量得零件长3厘米．这个零件实际长多少厘米．
<gadget id="calculator">15 / 1</gadget>
<output>15</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>