BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Time speed & work............

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 155
Joined: Wed Sep 22, 2010 3:54 am
Thanked: 6 times
by pzazz12 » Mon Oct 04, 2010 4:17 am
Three friends-whose walking rates are 1 ft./sec., 3ft./sec.,and 6ft./sec. start together walking in the same direction around a circular track that is 300 feet in circumference.After how many minutes are the three of them together again?

A. 5 mins
B. 10 mins
C. 15 mins
D. 3 mins
E. 7 mins


help me to solve it......
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Senior | Next Rank: 100 Posts
Posts: 82
Joined: Sat Aug 21, 2010 8:18 am
Location: India
Thanked: 5 times

by sumit.sinha » Mon Oct 04, 2010 4:54 am
pzazz12 wrote:Three friends-whose walking rates are 1 ft./sec., 3ft./sec.,and 6ft./sec. start together walking in the same direction around a circular track that is 300 feet in circumference.After how many minutes are the three of them together again?

A. 5 mins
B. 10 mins
C. 15 mins
D. 3 mins
E. 7 mins


help me to solve it......
IMO A.
Cheers,
Sumit
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pmFollowed by: 88 members
Location: Milpitas, CA
Thanked: 447 times

by Rahul@gurome » Mon Oct 04, 2010 6:17 am
Friend with a speed of 1 ft./sec can walk 300 ft in 300 sec or 300/60 = 5 minutes or take 1 lap in 5 minutes.
Friend with a speed of 3 ft./sec can walk 300 ft in 300/3 sec 100 sec or 100/60 = 5/3 minutes or 3 laps in 5 minutes.
Friend with a speed of 6 ft./sec can walk 300 ft in 300/6 sec 50 sec or 50/60 = 5/6 minutes or 6 laps in 5 minutes.

Therefore, the three of them are together again after 5 minutes.

[spoiler]The correct answer is (A).[/spoiler]
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 17
Joined: Wed Sep 29, 2010 8:14 am
Thanked: 1 times

by vijchid » Mon Oct 04, 2010 12:07 pm
I see that you can get the answer by assuming that they meet at the starting point, but how can you assume that they meet at the starting point. Is there any way we can solve this problem by equations?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members
Location: New York, NY
Thanked: 13060 times
GMAT Score:790

by GMATGuruNY » Mon Oct 04, 2010 12:26 pm
pzazz12 wrote:Three friends-whose walking rates are 1 ft./sec., 3ft./sec.,and 6ft./sec. start together walking in the same direction around a circular track that is 300 feet in circumference.After how many minutes are the three of them together again?

A. 5 mins
B. 10 mins
C. 15 mins
D. 3 mins
E. 7 mins


help me to solve it......
Rates per minute for the 3 friends:
60*1 = 60ft/min
60*3 = 180ft/min
60*6 = 360ft/min.

Now we can plug in the answers, which represent the time spent traveling around the track. We should start with the smallest answer choice.

Answer choice D:
60*3 = 180 ft.
180*3 = 540 feet = 1 lap + 240 ft.
Doesn't work.

Answer choice A:
60*5 = 300 ft = 1 lap
180*5 = 900 ft. = 3 laps
360*5 = 1800 ft. = 6 laps
Success!

The correct answer is A.

I think that plugging in the answers is just as quick as -- if not quicker than -- coming up with an equation that we would then have to solve.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1