A wooden stick with a length of 24 meters is sawed every 4 meters, and it takes 4 minutes to saw each time. How long did it take to saw the stick?
一根长24米的木棒，每4米锯一段，锯一次用4分钟．锯完这根木棒用多长时间？
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>