gmat preparation courses

It is currently Wed Dec 13, 2017 10:29 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: GMAT Speed / Distance / Time
PostPosted: Fri Jul 22, 2011 2:40 pm 
Offline

Joined: Sun May 30, 2010 2:23 am
Posts: 498
Alex leaves Atlanta heading directly toward Philadelphia at 8:00 a.m., traveling at 50 miles per hour. Heidi leaves Philadelphia, 600 miles away, heading directly for Atlanta at the same time, traveling at 70 miles per hour. At what time will they pass each other?

A. 1 p.m.
B. 2 p.m.
C. 2:45 p.m.
D. 3 p.m.
E. 3:30 p.m.


1) The distance between Atlanta and Philadelphia is 600 miles.
Image

2) Heidi starts in Philadelphia and Alex starts in Atlanta, both at the same time, 8:00 a.m. Alex travels at 50 miles per hour, while Heidi travels at 70 miles per hour.
Image

3) After T hours they met. The formula for distance is speed × time = distance. Therefore Alex drove 50T miles, while Heidi traveled 70T miles.
Image

4) The sum of the distances they travelled is the whole distance between Atlanta and Philadelphia. So we have the following equation:
50T + 70T = 600
120T = 600
T = 5
Image

5) 8:00 a.m. + 5 hours = 1:00 p.m.
The correct answer is A.
Image


Attachments:
optimized_step-5.jpg [33.9 KiB]
Not downloaded yet
optimized_step-4.jpg [29.55 KiB]
Not downloaded yet
optimized_step-3.jpg [23.01 KiB]
Not downloaded yet
optimized_step-2.jpg [22.14 KiB]
Not downloaded yet
optimized_step-1.jpg [13.23 KiB]
Not downloaded yet
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group