There is a steel pipe, which is divided into 5 sections on average. It takes 5 minutes to saw each section. How many minutes will it take to saw all of them?
有一根钢管，平均分成5小段，每锯一段要花5分钟，全部锯完要花多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>20</result>