Saw the 5-meter-long steel bar into 12 sections of the same length, each section accounts for ((())/(())) of the total length, and each section is ((())/(())) meters long. If it takes 6 minutes to cut the steel bar twice, how many minutes will it take to saw the steel bar into 8 sections?
把5米长的钢筋锯成一样长的12段，每段占全长的((())/(()))，每段长((())/(()))米．如果锯断钢筋2次需6分钟，把这根钢筋锯成8段共需多少分钟．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

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

<result>21</result>