It is known that the length of the day increases by 2 * 10-2 seconds per 1000 years. When (approximately) the day will be 25 hours?

It is necessary for the duration of the day to increase by 1 hour, i.e. for 3600 seconds. For this, approximately 3600 / (2 * 10 ^ -2) = 180 * 10 ^ 3 times for 1000 years should pass, i.e. 180 million years.

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