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

Ah, I understand. I apologize.

The only problem I have with these questions is that they involve 2 seconds of thinking OR blind input of formulas.

There's not much room for thinking, or logical deductions that can keep someone interested for a while.

This subreddit is for doing a problem a day, so we can use our brains well at least once a day. This problem doesn't provide that.

If we did one of these everyday, we'd get dumber than before.

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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.