It takes 30 minutes to saw a piece of wood into 3 sections. According to this calculation, how many minutes will it take to saw it into 5 sections?
把一根木料锯成3段要30分钟，照这样计算，锯成5段需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>