A steel pipe is 12 meters long and it takes 12 minutes to saw it into 4 sections. How many minutes does it take to saw each time?
一根钢管长12米，锯成4段要12分钟，问每锯一次要多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<result>4</result>