2019 Mathematics Calendar Hints

Thank you for your interest in Mathematics 2019, Your Daily Epsilon of Math. Please contact us if you have any questions or comments. Thanks!

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Rebecca Rapoport and Dean Chung

Try factoring 1594593.
The boat will go faster downstream thus spend less time on that part of the trip. So you can't just average 20 and 30 to get the average time over the whole trip. (If you need another hint, consider what your denominator should be.)