A piece of wood with a length of 120 decimeters, if it takes 20 minutes to saw into 5 sections, how many minutes will it take to saw into 8 sections at this speed?
一根长120分米的木料，如果锯成5段需要20分钟，照这样的速度，锯成8段需要多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

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

<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<result>35</result>