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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Pat's watch gains an extra 10 seconds every 2 hours. Kim's [#permalink]

Show Tags

24 Mar 2013, 10:47

8

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

45% (medium)

Question Stats:

62% (02:06) correct
38% (01:08) wrong based on 242 sessions

HideShow timer Statistics

Pat's watch gains an extra 10 seconds every 2 hours. Kim's watch loses 5 seconds every 3 hours. If both watches are set to correct time at 8 o'clock in the morning and run without interruption, after 72 hours, what will be the difference in time between Pat's watch and Kim's watch?

Re: Pat's watch gains an extra 10 seconds every 2 hours. Kim's [#permalink]

Show Tags

24 Mar 2013, 10:53

4

This post received KUDOS

1

This post was BOOKMARKED

In 72 hours Pat's watch will gain 360 seconds, since in 2 hours it gains 10 seconds, that means in 1 hour 5 seconds and in 72 hours 72*5 seconds, i.e. 360 seconds or 6 mins. Kim's watch loses 5 seconds in 3 hours, in 72 hours it will loose 72/3 * 5 = 24*5 = 120 seconds = 2 mins. Total difference 6 - (-2, it lost 2 mins ) = 6 + 2 = 8 mins.

Re: Pat's watch gains an extra 10 seconds every 2 hours. Kim's [#permalink]

Show Tags

24 Mar 2013, 14:39

This is how I solved this..

10s/2h, 72/2 -> 36 (and then the /h value x10) -> 36x10 = 360. Go on with /6 -> 6min 5s/3h, 72/3 -> 24 (and then the /h value x5) -> 36x5 = 120. Go on with /6 -> 2 (sine it's a loss it's -2)

-2 to 6 = 8, hence E (I did not get it right first since I personally missed the "loss")
_________________

Pat's watch gains an extra 10 seconds every 2 hours. Kim's [#permalink]

Show Tags

14 Jul 2014, 23:17

Bunuel,

This question is using a kind of Relative velocity fundamental, but is put forward in a different manner. Opposite speeds do add up in relative calculations.
_________________

Like my post Send me a Kudos It is a Good manner. My Debrief: http://gmatclub.com/forum/how-to-score-750-and-750-i-moved-from-710-to-189016.html

Last edited by honchos on 12 Nov 2014, 11:57, edited 4 times in total.

Pat's watch gains an extra 10 seconds every 2 hours. Kim's watch loses 5 seconds every 3 hours. If both watches are set to correct time at 8 o'clock in the morning and run without interruption, after 72 hours, what will be the difference in time between Pat's watch and Kim's watch?

(A) 4 min

(B) 6 min

(C) 6 min 40 sec

(D) 7 min 30 sec

(E) 8 min

In 72 hours Pat's watch will gain an extra 72/2*10 = 360 seconds.

In 72 hours Kim's watch will lose 72/3*5 = 120 seconds.

Hence the difference will be 360 + 120 = 480 seconds or 8 minutes.

Re: Pat's watch gains an extra 10 seconds every 2 hours. Kim's [#permalink]

Show Tags

23 Aug 2015, 01:52

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.
_________________

Re: Pat's watch gains an extra 10 seconds every 2 hours. Kim's [#permalink]

Show Tags

07 Jan 2017, 06:35

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.
_________________

Pat's watch gains an extra 10 seconds every 2 hours. Kim's [#permalink]

Show Tags

07 Jan 2017, 11:35

megafan wrote:

Pat's watch gains an extra 10 seconds every 2 hours. Kim's watch loses 5 seconds every 3 hours. If both watches are set to correct time at 8 o'clock in the morning and run without interruption, after 72 hours, what will be the difference in time between Pat's watch and Kim's watch?

(A) 4 min

(B) 6 min

(C) 6 min 40 sec

(D) 7 min 30 sec

(E) 8 min

watch P gains 5 sph watch K loses 5/3 sph 5+5/3=20/3 sph 72 h*20/3 sph=480 s 480 s/60 spm=8 min

Re: Pat's watch gains an extra 10 seconds every 2 hours. Kim's [#permalink]

Show Tags

01 Feb 2017, 02:46

megafan wrote:

Pat's watch gains an extra 10 seconds every 2 hours. Kim's watch loses 5 seconds every 3 hours. If both watches are set to correct time at 8 o'clock in the morning and run without interruption, after 72 hours, what will be the difference in time between Pat's watch and Kim's watch?

(A) 4 min

(B) 6 min

(C) 6 min 40 sec

(D) 7 min 30 sec

(E) 8 min

In every 6 hours, Pat GAINS (10 + 10 +10) = 30 seconds

In every 6 hours, Kim LOSES (5 + 5) = 10 seconds or "GAINS" (-10) seconds

In every 6 hours, the time difference ==> 30 - (-10) = 40 seconds

In 72 hours, time difference ==> 72hrs/6hrs * 40 seconds = 480 seconds or 8 minutes

(E)
_________________

Kindly press kudos if you find my post helpful

gmatclubot

Re: Pat's watch gains an extra 10 seconds every 2 hours. Kim's
[#permalink]
01 Feb 2017, 02:46

There’s something in Pacific North West that you cannot find anywhere else. The atmosphere and scenic nature are next to none, with mountains on one side and ocean on...

Talking with potential roommates, looking for apartment options, keeping my documents in order, etc. – there’s just a lot going on these days. September and the start of...

Joe Navarro is an ex FBI agent who was a founding member of the FBI’s Behavioural Analysis Program. He was a body language expert who he used his ability to successfully...