It takes 3 hours and 20 minutes to saw a piece of wood with a uniform thickness into 9 small pieces; if it is cut into 0.7-meter-long pieces, it takes 1 hour and 40 minutes. How many meters is this piece of wood?
把一根粗细均匀的木料，锯成9小段，要3小时20分；如果锯成都是0.7米长的小段，共用去1小时40分，这根木料长多少米．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">200 / 8</gadget>
<output>25</output>

<gadget id="calculator">100 / 25</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 0.7</gadget>
<output>3.5</output>

<result>3.5</result>