A piece of wood is 16 meters long, and it is sawed into small pieces of 4 meters long. It takes 3 minutes to cut each section. How many minutes will it take to saw the whole piece of wood?
一根木料长16米，把它锯成4米长的小段，每锯下一段要3分钟，把这根木料全部锯完要多少分钟？
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

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

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

<result>9</result>