If it takes 7 minutes for a worker to saw a piece of wood into 5 sections, how many minutes will it take to saw the piece of wood into 9 sections at this speed?
一位工人把一根木头锯成5段用7分钟，照这样的速度把这根木头锯成9段用多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">7 / 4</gadget>
<output>7/4 = around 1.75</output>

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

<gadget id="calculator">(7/4) * 8</gadget>
<output>14</output>

<result>14</result>