It takes 2 minutes to saw an 8-meter-long wooden strip into 4 sections, and how many minutes it takes to complete the task.
把一根8米长的木条，锯成4段，每锯一次需要2分钟，完成任务需要多少分钟．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>