It takes 9 seconds to cut a long rope into 4 pieces. At this speed, how many seconds will it take to cut the same long rope into 9 pieces?
把一根长绳剪成4根，需要9秒钟，照这样的速度，要把同样的长绳剪成9根，需要多少秒钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

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

<gadget id="calculator">3 * 8</gadget>
<output>24</output>

<result>24</result>