A steel pipe is 8 meters long, and it should be sawed into 5 sections on average. It takes 3 minutes to saw each section, how long does it take to finish sawing?
一根钢管长8米，要把它平均锯成5段．每锯下一段需要3分钟，锯完一共需要多长时间？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>12</result>