Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 24 May 2017, 02:05

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# M17, Q 37

Author Message
Manager
Joined: 11 Apr 2009
Posts: 163
Followers: 2

Kudos [?]: 101 [0], given: 5

### Show Tags

05 Nov 2009, 10:31
1
This post was
BOOKMARKED
Andrew and Stephen drive on the highway in the same direction at respective rates of 72 and 80 kmh. If Stephen is 4 km behind Andrew, by how much does he have to increase his speed to catch up with Andrew in 20 minutes?

1 kmh
2 kmh
3 kmh
4 kmh
5 kmh

Can someone explain this in detail?
Thanks
SVP
Joined: 29 Aug 2007
Posts: 2476
Followers: 70

Kudos [?]: 774 [1] , given: 19

### Show Tags

05 Nov 2009, 13:20
1
KUDOS
gmatprep09 wrote:
Andrew and Stephen drive on the highway in the same direction at respective rates of 72 and 80 kmh. If Stephen is 4 km behind Andrew, by how much does he have to increase his speed to catch up with Andrew in 20 minutes?

1 kmh
2 kmh
3 kmh
4 kmh
5 kmh

Can someone explain this in detail?
Thanks

In 20 minuets, Andrew can drive 20 (72/60) = 24 km
Since Andrew is already 4 km ahead of Stephen, Stephen has to cover 28 km in 20 minuets.
Then, the km/h speed for Stephen would be = (28/20)60 = 84.
Increased speed = 84 - 80 = 4km/h
_________________

Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html

GT

Re: M17, Q 37   [#permalink] 05 Nov 2009, 13:20
Similar topics Replies Last post
Similar
Topics:
M17 Q 1 1 17 Feb 2012, 18:34
2 m17 q25 3 13 Jul 2012, 12:28
M17 Q12 1 09 Jun 2010, 02:01
m17, q36 3 24 Feb 2013, 03:49
9 M17Q5 20 18 Jan 2013, 17:36
Display posts from previous: Sort by

# M17, Q 37

Moderator: Bunuel

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.