A piece of wood is 18 meters long. Xiao Li saws it into pieces of 2 meters each. It takes 3 minutes to saw each time. How many minutes does it take to finish the last section?
一根木头长18米，小李把它锯成每段2米的木料，锯一次要3分钟，需要多少分钟锯完最后一段．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>