
Differential Equations Ordinary and Partial Differential Equations Math Forum 
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April 6th, 2018, 09:41 PM  #1 
Senior Member Joined: Aug 2012 Posts: 2,259 Thanks: 686  The famous snowplow math problem
I saw this Youtube video today. It's a really striking puzzle. I confess to not taking the trouble to follow each step myself, but differential equations fans will really enjoy this. Here is the problem. One day it started snowing in the morning at a heavy and steady rate. A snow plow started out at noon, going 2 miles in the first hour and 1 mile in the second hour. What time did it start snowing? This is not a joke or a trick. It's a problem from a 1942 textbook on differential equations. It has a perfectly sensible solution using elementary calculus. Here's the vid. Last edited by Maschke; April 6th, 2018 at 09:47 PM. 
April 6th, 2018, 09:50 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,404 Thanks: 1306 
You left out a rather key point in your transcription. Snow removal is done at a constant rate. 
April 7th, 2018, 08:47 AM  #3 
Senior Member Joined: May 2015 From: Arlington, VA Posts: 397 Thanks: 27 Math Focus: Number theory 
The Golden Mean!

April 7th, 2018, 08:56 AM  #4  
Senior Member Joined: Oct 2009 Posts: 771 Thanks: 278  Quote:
If you enjoy this do the following book: https://www.amazon.com/Differential.../dp/0070575401 It has this problem, and many similar cool ones.  
April 7th, 2018, 10:04 AM  #5 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,636 Thanks: 2621 Math Focus: Mainly analysis and algebra  
April 7th, 2018, 10:46 AM  #6  
Senior Member Joined: Sep 2015 From: USA Posts: 2,404 Thanks: 1306  Quote:
We are not amused.  

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famous, impossible, math, problem, puzzle, snowplow 
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