题目内容：
两根同样长的蜡烛，点完粗蜡烛要3小时，点完细蜡烛要1小时。同时点燃两根蜡烛，一段时间后，同时熄灭，发现粗蜡烛的长度是细蜡烛的3倍。两根蜡烛燃烧了（ ）。
A.30分钟 B.35分钟 C.40分钟 D.45分钟
参考答案：
答案解析：
选择题：两根同样长的蜡烛，点完粗蜡烛要3小时，点完细蜡烛要1小时。同时点燃两根蜡烛，一段时间后，同时熄灭，发现粗蜡烛的长度是细蜡烛的3倍。两根蜡烛燃烧了（ ）。A.3
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