GMAT Changed on April 16th - Read about the latest changes here

It is currently 24 May 2018, 08:38

Happening NOW:

INSEAD Rolling Out R1 Admission Decisions - Join CHAT Room2 to Get Latest Updates from Fellow Applicants


Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 se

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
User avatar
Joined: 04 Aug 2013
Posts: 102
Location: India
Schools: McCombs '17
GMAT 1: 670 Q47 V35
GPA: 3
WE: Manufacturing and Production (Pharmaceuticals and Biotech)
In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 se [#permalink]

Show Tags

New post 06 Jun 2016, 20:23
5
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

44% (02:18) correct 56% (02:28) wrong based on 77 sessions

HideShow timer Statistics

In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 sec then the speed of C.

A. 5m/sec
B. Speed of C can not be found with given data.
C. 4.7m/sec
D. 4m/sec
E. 4.5m/sec
Expert Post
Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 5779
Re: In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 se [#permalink]

Show Tags

New post 06 Jun 2016, 20:53
Expert's post
2
This post was
BOOKMARKED
anceer wrote:
In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 sec then the speed of C.

A. 5m/sec
B. Speed of C can not be found with given data.
C. 4.7m/sec
D. 4m/sec
E. 4.5m/sec



Hi,

Its more of a Indian CAT Qs than a GMAT Qs.....

Anyways the solution is.....



When A finishes the race , B is at 85m....
and when B travels 100m, C is at 100-10 = 90m.....
so C loses 10m on B's 100m................
or C will lose 1 m for every 10m of B.....
so C will lose 8.5 m when B travels 85m.....

From above we get corelation of all three..
A is at 100, B is at 85 and C is at 85-8.5 = 76.5.....

So C is 100-76.5 = 23.5 m behind A...
and C also loses by 5 secs, this means C covers this 23.5m in 5 secs..
speed of C =\(\frac{23.5}{5} = 4.7\) mps

C
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html


GMAT online Tutor

Expert Post
Veritas Prep GMAT Instructor
User avatar
P
Joined: 16 Oct 2010
Posts: 8077
Location: Pune, India
Re: In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 se [#permalink]

Show Tags

New post 06 Jun 2016, 22:53
anceer wrote:
In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 sec then the speed of C.

A. 5m/sec
B. Speed of C can not be found with given data.
C. 4.7m/sec
D. 4m/sec
E. 4.5m/sec



Here are a couple of posts on races:
http://www.veritasprep.com/blog/2014/08 ... re-higher/
http://www.veritasprep.com/blog/2014/09 ... -on-races/
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Expert Post
2 KUDOS received
Veritas Prep GMAT Instructor
User avatar
P
Joined: 16 Oct 2010
Posts: 8077
Location: Pune, India
Re: In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 se [#permalink]

Show Tags

New post 16 Oct 2017, 11:46
2
This post received
KUDOS
Expert's post
anceer wrote:
In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 sec then the speed of C.

A. 5m/sec
B. Speed of C can not be found with given data.
C. 4.7m/sec
D. 4m/sec
E. 4.5m/sec


Responding to a pm:

In the same time, A covers 100m and B covers 85 m.
SpeedA : SpeedB = 100:85 = 20:17

In the same time, B covers 100m and C covers 90m.
SpeedB : SpeedC = 100:90 = 10:9

SpeedA : SpeedB : SpeedC = 200:170:153
A covers 200m in the time that C covers 153 m so in a 100 m race, when A finishes, C would have covered 76.5 m. Since A beats C by 5 secs, C covers the leftover 23.5 m in 5 secs.
Speed of C = 23.5/5 = 4.7 m/s

Answer (C)
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Re: In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 se   [#permalink] 16 Oct 2017, 11:46
Display posts from previous: Sort by

In a 100m, A beats B by 15m and B beats C by 10m. If A beats C by 5 se

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.