There is a piece of wood that is going to be sawed into 5 sections. It takes 3 minutes to saw a small section each time, and how many minutes to saw the whole piece?
有一根木料，打算锯成5段，每次锯下一小段用3分钟，全锯完用几分钟？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>