It takes 8 minutes to saw a 25-meter-long water pipe into 5 sections, how many minutes will it take in total?
把一根25米长的水管锯成5段，每锯一次用8分钟，一共需要多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<result>32</result>