A piece of wood with a length of 12 meters is sawn into sections every 3 meters, and each sawing takes 2 minutes. How many minutes does it take to finish sawing this piece of wood?
将一根长12米长的木料，每3米锯成一段，每锯一次需2分钟，锯完这根木料需要多少分钟．
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>