If a 12.4-meter-long wooden strip is sawn into 3.1-meter-long short wooden strips, if each section takes 2.5 minutes, how many minutes will it take to complete the sawing?
把一根长12.4米长的木条锯成3.1米长的短木条，如果每锯一段用2.5分钟，一共需要多少分钟能锯完？
<gadget id="calculator">12.4 / 3.1</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2.5</gadget>
<output>7.5</output>

<result>7.5</result>