If it takes 3 minutes to saw a steel pipe into 2 sections, how many minutes will it take to saw it into 6 sections?
把一根钢管锯成2段需要3分钟，锯成6段需要多少分钟．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

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

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>