If it takes 3 minutes to saw 1 section of wood, how many minutes will it take to saw a piece of wood into 5 sections?
锯1节木头用3分钟，把一根木头锯成5段需要多少分钟．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>12</result>