If you're experiencing a roadblock with one of the Manhattan Prep GRE math strategy guides, help is here!
momo1
Forum Guests
 
Posts: 1
Joined: Sat Dec 08, 2012 1:49 am
 

Rates & Work

by momo1 Sat Mar 09, 2013 11:41 pm

My question comes from Ch 3 of the Words Problems strategy guide. Check Your Skills question number 3. In this problem in the RTD chart they added the distances to get 2d. Can someone explain why they did this?
tommywallach
Manhattan Prep Staff
 
Posts: 1917
Joined: Thu Mar 31, 2011 11:18 am
 

Re: Rates & Work

by tommywallach Sun Mar 10, 2013 9:13 pm

Hey Momo,

They don't actually do anything with it, so I wouldn't worry about it. If you're asking why they placed it there, it's merely to remind people that you can't add either rates or times, but you can add distances. However, in this example, we don't need to do anything with that information, and the equations reflect that.

Hope that helps!

-t