It is currently 12 Dec 2017, 14:04

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A car traveling at a certain constant speed takes 2 seconds longer to

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

Hide Tags

Manager
Manager
User avatar
Joined: 06 Apr 2010
Posts: 141

Kudos [?]: 968 [0], given: 15

Reviews Badge
A car traveling at a certain constant speed takes 2 seconds longer to [#permalink]

Show Tags

New post 08 Sep 2010, 10:30
2
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

69% (02:23) correct 31% (01:55) wrong based on 94 sessions

HideShow timer Statistics

A car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 75 kilometers per hour. At what speed, in kilometers per hour, is the car traveling?

A. 71.5
B. 72
C. 72.5
D. 73
E. 73.5
[Reveal] Spoiler: OA

Kudos [?]: 968 [0], given: 15

Senior Manager
Senior Manager
avatar
Joined: 06 Jun 2009
Posts: 327

Kudos [?]: 85 [0], given: 0

Location: USA
WE 1: Engineering
Re: A car traveling at a certain constant speed takes 2 seconds longer to [#permalink]

Show Tags

New post 08 Sep 2010, 10:42
udaymathapati wrote:
A car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 75 kilometers per hour. At what speed, in kilometers per hour, is the car traveling?
A. 71.5
B. 72
C. 72.5
D. 73
E. 73.5


B

75 * T = 1 km => T = 1/75 km/h

V*(T+2/3600) = 1

V (1/75 + 2/3600) = 1 => V = 72 km/h
_________________

All things are possible to those who believe.

Kudos [?]: 85 [0], given: 0

3 KUDOS received
Intern
Intern
avatar
Joined: 11 Aug 2010
Posts: 23

Kudos [?]: 34 [3], given: 37

Schools: SUNY at Stonyb Brook
WE 1: 4 yrs
Re: A car traveling at a certain constant speed takes 2 seconds longer to [#permalink]

Show Tags

New post 08 Sep 2010, 18:48
3
This post received
KUDOS
1
This post was
BOOKMARKED
If a car travels at speed of 75 kilometer per hour ,time( in hours) it takes to travel 1 kilometer = 1/75 hours = 3600 /75 seconds = 48 seconds.

It is given that it took 2 more seconds to travel than it would take at speed of 75 kph so the time it took is 48 +2 = 50 seconds

new speed = 3600 /50 kilometer per hour = 72 <--Answer B.
_________________

Consider giving Kudos if my post helped you in some way :)

Kudos [?]: 34 [3], given: 37

Intern
Intern
avatar
Joined: 02 Sep 2010
Posts: 6

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

Re: A car traveling at a certain constant speed takes 2 seconds longer to [#permalink]

Show Tags

New post 09 Sep 2010, 06:18
The similar problems with a few different solving methods is at Youtube:


http://www.youtube.com/watch?v=KkF7qq0glLA

http://www.youtube.com/watch?v=FC2JtUFt-jE

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

Senior Manager
Senior Manager
avatar
Joined: 06 Jun 2009
Posts: 327

Kudos [?]: 85 [0], given: 0

Location: USA
WE 1: Engineering
Re: A car traveling at a certain constant speed takes 2 seconds longer to [#permalink]

Show Tags

New post 09 Sep 2010, 06:37
amitjash wrote:
This is paper test problem and i took long time to solve it


There is another problem like this one. It has the same fundamentals, however, worded different, which makes it look much tougher. You might want to take a look at that. It has something to do with two cars travelling towards each other and crossing at a certain point. It goes on to say that if Car A travelled so much faster, then they would cross so many miles away from the earlier crossing point.
_________________

All things are possible to those who believe.

Kudos [?]: 85 [0], given: 0

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 14897

Kudos [?]: 287 [0], given: 0

Premium Member
Re: A car traveling at a certain constant speed takes 2 seconds longer to [#permalink]

Show Tags

New post 09 Oct 2017, 09:33
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Kudos [?]: 287 [0], given: 0

Expert Post
Target Test Prep Representative
User avatar
S
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 1793

Kudos [?]: 980 [0], given: 5

Re: A car traveling at a certain constant speed takes 2 seconds longer to [#permalink]

Show Tags

New post 12 Oct 2017, 17:01
Expert's post
1
This post was
BOOKMARKED
udaymathapati wrote:
A car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 75 kilometers per hour. At what speed, in kilometers per hour, is the car traveling?

A. 71.5
B. 72
C. 72.5
D. 73
E. 73.5


If a car is traveling at 75 km per hour, then the number of seconds (x) it takes to travel 1 km can be calculated using the following proportion (note that 1 hour = 3,600 seconds):

75/3600 = 1/x

75x = 3600

x = 48 sec.

Thus, it takes 48 seconds to travel 1 km if the speed is 75 km/h. Since the car actually takes 2 more seconds (i.e., 50 seconds) to travel 1 km, its speed (r) can be calculated using the following proportion:

r/3600 = 1/50

50r = 3600

r = 72 km/h

Answer: B
_________________

Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Kudos [?]: 980 [0], given: 5

Re: A car traveling at a certain constant speed takes 2 seconds longer to   [#permalink] 12 Oct 2017, 17:01
Display posts from previous: Sort by

A car traveling at a certain constant speed takes 2 seconds longer to

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


GMAT Club MBA Forum Home| About| Terms and Conditions| 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®.