May 26th, 2013, 04:22 PM  #1 
Newbie Joined: May 2013 Posts: 3 Thanks: 0  Related Rates
I've done this problem so many times and I don't understand what i'm doing wrong. The problem is... At noon, ship A is 20 nautical miles due west of ship B. Ship A is sailing west at 25 knots and ship B is sailing north at 16 knots. How fast (in knots) is the distance between the ships changing at 3 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.) 
May 26th, 2013, 05:02 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,879 Thanks: 1087 Math Focus: Elementary mathematics and beyond  Re: Related Rates
Let d(t) be the function of distance between the two ships in terms of t hours past noon: 

Tags 
rates, related 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Related Rates  ChloeG  Calculus  2  November 8th, 2011 04:11 PM 
related rates  kfarnan  Calculus  2  October 13th, 2011 03:18 PM 
Related Rates?????????  imcutenfresa  Calculus  4  September 24th, 2009 12:22 PM 
related rates  mathman2  Calculus  3  February 12th, 2009 05:52 AM 
Related Rates Help Please  pranavpuck  Calculus  11  November 30th, 2008 09:32 AM 