
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
January 12th, 2013, 01:28 PM  #11  
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039  Re: Distance, rate, time problem Quote:
@v15..........600...........>9t Results in two "different "t's" ...see that? Agree that's it's confusing: a bit like the missing dollar riddle.  
January 12th, 2013, 02:09 PM  #12  
Newbie Joined: Jan 2013 Posts: 13 Thanks: 0  Re: Distance, rate, time problem Quote:
So why do i need to plugin (v+15) into t, instead of (v15)?  
January 12th, 2013, 08:01 PM  #13  
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039  Re: Distance, rate, time problem Quote:
(1): the "t" here is the result of travelling 600 miles at speed v+15 ; t = 600 / 150 = 4 (2): the "t" here is the result of travelling 600 miles at speed v15 ; t = 600 / 120 = 5 So the t in (1) is different from the t in (2). Good luck.  
January 12th, 2013, 11:26 PM  #14 
Newbie Joined: Jan 2013 Posts: 13 Thanks: 0  Re: Distance, rate, time problem
I got it!!! Thank you Denis and Mark, for your patience and explanations! After all your feedback and my working out problems in different ways, I understood what I was doing wrong. For anyone else having problems with these because they are asked to use a pesky table to represent d=rt, just remember that you are simply dealing with two rows of equations. First try to see if anything in the word problem points to "adding" the distances or the time. If it does, try using an addition equation. If anything in the word problem is equal, then you can try setting up an equality. IF you have to make substitutions, don't use the general d=rt and then reason what is required. (could work but prone to error, or ambiguity) USE either d=rt you created from the word problem to solve for the variable you need! The confusion is that the "addition" or "equality" method requires you to use d=rt generally to setup your addition or equality, but when substitution is required, a filled in d=rt is required. Being comfortable with those two, you should be able to handle if two unknowns are given. Happy day 
January 13th, 2013, 04:38 AM  #15 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039  Re: Distance, rate, time problem
Hey you can apply for your pilot's liscense now 
January 13th, 2013, 11:07 AM  #16 
Newbie Joined: Jan 2013 Posts: 13 Thanks: 0  Re: Distance, rate, time problem
hmmm m. that is an idea, lol


Tags 
distance, problem, rate, time 
Search tags for this page 
a plane flies 600 miles west ( into the wind ) and makes the return trip following the same path,A plane flies 600 miles west (into the wind),a plane files 600 miles west,a plane flies 600 miles west,A plane flies 600 miles west into the wind and makes the return trip following the same flight path.
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Time rate distance world problem  Nrb  Algebra  6  September 9th, 2013 03:18 AM 
Distance, rate, and time help.  HellBunny  Algebra  3  August 16th, 2012 01:46 PM 
D=RT (Distance = Rate x Time)  Mighty Mouse Jr  Algebra  4  July 9th, 2010 07:47 PM 
D=RT (Distance = Rate x Time)  Mighty Mouse Jr  Algebra  4  June 29th, 2010 04:24 PM 
help on distance, rate, time  marie789  Algebra  2  December 11th, 2007 09:13 PM 