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Ok, over a 500,000 year period, the temperature of a locale increases by 10 degrees Celsius....

Ok, over a 500,000 year period, the temperature of a locale increases by 10 degrees Celsius. During the second 5 degrees Celsius increase, the process speeds up by a factor of 21. What is the actual length of time for both the first and second 5 degree Celsius increases?

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