There is a piece of wood, and each piece is going to be sawed into 4 sections. It takes 3 minutes to saw each piece. How many minutes will it take to saw all the pieces?
有一根木料，打算把每根锯成4段，每锯开一处，需要3分钟，全部锯完需要多少分钟？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>