王叔叔有一只手表，他发现手表比家里的闹钟每小时快30秒，而闹钟比标准时间每小时快30秒。王叔叔的手表与标准时间一昼夜会相差多少秒？

（答案是不是相差0秒呢？不是的哦，两次参照的时间是不同的，第一次是与闹钟比，第二次是与标准时间比，也就是单位“1”不同。）

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