钟声的问题

  • 时间:2020-04-12 11:38:36
  • 分类:数学世界
  • 阅读:153 次

数学百题之一:钟声的问题:小明家离火车站很近,他每天都可以根据车站大楼的钟声起床。车站大楼的钟,每敲响一下延时3 秒,间隔1 秒后再敲第二下。假如从第一下钟声响起,小明就醒了,那么到小明确切判断出已是清晨6 点,前后共经过了几秒钟?

分析与解:从第一下钟声响起,到敲响第6 下共有5 个“延时”、 5 个“间隔”,共计(3+1)×5=20 秒。当第6 下敲响后,小明要判断是否清晨6点,他一定要等到“延时3 秒”和“间隔1 秒”都结束后而没有第7 下敲响,才能判断出确是清晨6 点。因此,答案应是:(3+1)×6=24(秒)。

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