There are 10 cylindrical logs. It takes 3 minutes to saw each of them into 3 sections. How many minutes will it take to saw all 10 logs?
有10根圆柱形木头，要把每根都锯成3段，每锯一段需要3分钟，把10根木头锯完需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 10 * 3</gadget>
<output>60</output>

<result>60</result>