A piece of wood is 10 meters long, and it should be divided into 5 equal parts. It takes 3 minutes to saw the next section, and how many minutes will it take to finish sawing this piece of wood?
一根木头长10米，要把它平均分成5段．每锯下一段需要3分钟，锯完这根木头要用几分钟？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>12</result>