If it takes 20 minutes to saw a piece of wood into 5 sections, how many hours will it take to saw this piece of wood into 9 sections?
把一根木头锯成5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">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>