A steel pipe is 8 meters long and is sawn into 1 meter sections. If it takes 3 minutes to saw each time, how many minutes will it take to complete the saw?
一根钢管长8米，锯成1米一段，如果每锯一次需要3分钟，要几分钟才能锯完？
<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">3 * 7</gadget>
<output>21</output>

<result>21</result>