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 The Hat and the River (Posted on 2003-05-05)
Bob is having a nice camping/fishing trip along a river. He leaves his campsite early in the morning, and gets on his boat, heading full throttle upstream.

After going for exactly one mile, his hat flips off of his head, and starts floating downstream. Bob doesn't realize that his hat has fallen off for five minutes, but then he notices that it's missing, and turns full throttle downstream.

He finally catches the hat at exactly the same spot as he camped that morning. The question is, how fast was the water traveling?

(Assume that he travels the same speed the entire time and that there is no turn around time.)

 See The Solution Submitted by Jonathan Waltz Rating: 2.0000 (4 votes)

 Subject Author Date Puzzle Solution K Sengupta 2008-11-17 23:52:07 Answer K Sengupta 2008-11-16 00:11:59 Generalization of three equations, three unknowns Kenny M 2005-12-10 13:42:32 All your answers are incorrect: michael 2005-12-09 17:47:49 re: Laborious solution Michael Cottle 2004-12-29 05:51:51 Laborious solution Larry 2004-12-28 22:47:51 re: Water speed???? re: General Shortcut Formula Hugo 2004-12-28 18:24:12 Water speed???? re: General Shortcut Formula Michael Cottle 2004-12-28 04:55:29 ??? lesa 2003-09-05 01:36:21 re(3): General Shortcut Formula Vinodhan Selvarajalu 2003-05-08 02:44:58 Solution spinoza 2003-05-08 00:56:08 re(2): General Shortcut Formula Jayaram S 2003-05-08 00:15:54 re: General Shortcut Formula Vinodhan Selvarajalu 2003-05-07 21:16:07 re: solution Vinodhan Selvarajalu 2003-05-07 21:12:18 My Guess (first time user) Nicole 2003-05-07 06:50:31 General Shortcut Formula Jayaram S 2003-05-07 00:14:54 re: hmmm.. got it Ryan 2003-05-06 18:58:16 re: I remember this one Ryan 2003-05-06 18:57:16 re: Multiple Solutions? Ryan 2003-05-06 18:48:47 re: solution Brian Smith 2003-05-06 08:12:18 hmmm.. got it Jon 2003-05-06 08:01:46 solution Charlie 2003-05-05 16:24:12 I remember this one Brian Smith 2003-05-05 10:18:10 Multiple Solutions? DJ 2003-05-05 10:08:46

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