If it takes 0.4 hours to saw a piece of wood into 5 sections, how many hours will it take to saw the same piece of wood into 8 sections?
将一根木料锯成5段用了0.4小时，如果要把同样的木料锯成8段，需要多少小时．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">0.4 / 4</gadget>
<output>0.1</output>

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

<gadget id="calculator">0.1 * 7</gadget>
<output>0.7</output>

<result>0.7</result>