有一段木头长4米,要把它锯成8段,每锯一段要3分钟,共要几分钟?
问题描述：
有一段木头长4米,要把它锯成8段,每锯一段要3分钟,共要几分钟?
翻译成英文
答
The length of a log is four meters,which will be sawed into eight parts.How many minutes will it cost if three minutes can be taken per sawing one part?
Answer:21 minutes.