If it takes 20 minutes to saw a piece of wood into 4 sections, how many hours will it take to saw this piece of wood into 9 sections?
把一根木头锯成4段需要20分钟，照这样计算，把这根木头锯成9段需要多少小时？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<result>8/9 = around 0.888889</result>