It takes 3 minutes to saw a piece of wood 30 meters long. How many minutes will it take to saw the wood into 6 equal pieces?
锯一根30米长的木头，每锯一次要用3分钟．如果要把这根木头锯成相等的6段，一共要多少分钟．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>