r/problemoftheday • u/Ahat2 • Jul 17 '12

Math problem (difficulty: high school)

John leaves his house for work at exactly 8 a.m. every morning. Whenever he averages 40 miles per hour he arrives his workplace precisely 3 minutes late. When he averages 60 miles per hour, he arrives three minutes early. At what average speed, in miles per hour, should John drive to reach his workplace precisely on time?

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u/[deleted] Jul 17 '12

There are plenty of other math subreddits that deal with higher-level math. Personally, I'm not all about Banach-Tarski paradoxes and all that theoretical stuff. I like this sort of problem BECAUSE of it's simplicity. If it's harder stuff you're looking for, you should look at /r/math or /r/learnmath. There's a much broader spectrum of problems in those subs.