GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 17 Aug 2018, 06:04

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

A and B are running in opposite direction on a circular track

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

Hide Tags

Manager
Manager
avatar
S
Joined: 28 Jun 2018
Posts: 86
GMAT ToolKit User Premium Member Reviews Badge CAT Tests
A and B are running in opposite direction on a circular track  [#permalink]

Show Tags

New post 20 Jul 2018, 11:56
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

70% (01:51) correct 30% (02:06) wrong based on 27 sessions

HideShow timer Statistics

A and B are running in opposite directions on a circular track with radius of 7 miles. If they kept running continuously at their own uniform speeds till they met for the second time, What will be the sum of their respective speeds (miles/hr)?

1) A and B both starts from same point and cover same distance before first meeting.
2) A can cover entire circular track in 10 min.

_________________

if you getting bore , try this :
https://gmatclub.com/forum/if-n-0-is-4-n-1-divisible-by-5-1-n-is-the-integral-root-of-272101.html

GMAC official guides : https://gmatclub.com/forum/gmac-official-guides-the-master-directory-links-240610.html#p1854935

Give me kudos if you like it , it's totally harmless :)

Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 6540
Re: A and B are running in opposite direction on a circular track  [#permalink]

Show Tags

New post 20 Jul 2018, 20:40
1
1
kshitizbansal92 wrote:
A and B are running in opposite directions on a circular track with radius of 7 miles. If they kept running continuously at their own uniform speeds till they met for the second time, What will be the sum of their respective speeds (miles/hr)?

1) A and B both starts from same point and cover same distance before first meeting.
2) A can cover entire circular track in 10 min.


A and B could have been given car as poor guys ran for almost \(2\pi*r=2*7*22/7=44 miles each\) that too if the speeds were same ;)

Meeting second time mean they have covered 2 laps within themselves, so covered 88 miles
Sum of speed =88/(time taken)

1) A and B both starts from same point and cover same distance before first meeting.
This means the speeds are same but what is the speed not known

2) A can cover entire circular track in 10 min
Now this guy A is super human, as running 44miles in 10 minutes is just awesome. Speed =44/(10/60)=44*6=264 miles per hour.
But we don't know about B.
Insufficient

Combined..
So B also takes 10 minutes and he is also awesome with a speed of 264 miles per hour
Combined speed = 264*2=528 miles per hour .....

I am sure no good source would come up with such statistics
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


GMAT online Tutor

Re: A and B are running in opposite direction on a circular track &nbs [#permalink] 20 Jul 2018, 20:40
Display posts from previous: Sort by

A and B are running in opposite direction on a circular track

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

Events & Promotions

PREV
NEXT


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®.