Last visit was: 23 Apr 2026, 14:50 It is currently 23 Apr 2026, 14:50
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
User avatar
calreg11
User avatar
Joined: 27 Oct 2011
Last visit: 07 Mar 2013
Posts: 84
Own Kudos:
1,161
 [50]
Given Kudos: 4
Location: United States
Concentration: Finance, Strategy
Schools: HBS '15 (D) Marshall '15 (II) Anderson '15 (S) Stanford '15 (S) Haas '15 (S)
GPA: 3.7
WE:Account Management (Consumer Packaged Goods)
Schools: HBS '15 (D) Marshall '15 (II) Anderson '15 (S) Stanford '15 (S) Haas '15 (S)
Posts: 84
Kudos: 1,161
 [50]
Abby and Bobby type at constant rates of 80 words per minute 15 Apr 2012, 16:45
3
Kudos
Add Kudos
47
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

45% (medium)

Question Stats:

73% (02:09) correct 27% (02:29) wrong based on 1517 sessions

History

Date
Time
Result
Not Attempted Yet
Abby and Bobby type at constant rates of 80 words per minute and 60 words per minute, respectively. Bobby begins typing before Abby and has typed 600 words when Abby begins typing at 1:30 pm. If they continue typing at their respective rates, at what time will Abby have typed exactly 200 more words than Bobby?

A. 1:40 PM
B. 1:50 PM
C. 2:00 PM
D. 2:10 PM
E. 2:20 PM
ShowHide Answer
Official Answer
D
Most Helpful Reply
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 23 Apr 2026
Posts: 109,785
Own Kudos:
810,857
 [21]
Given Kudos: 105,853
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,785
Kudos: 810,857
 [21]
Abby and Bobby type at constant rates of 80 words per minute 15 Apr 2012, 16:58
10
Kudos
Add Kudos
11
Bookmarks
Bookmark this Post
calreg11
Abby and Bobby type at constant rates of 80 words per minute and 60 words per minute, respectively. Bobby begins typing before Abby and has typed 600 words when Abby begins typing at 1:30 pm. If they continue typing at their respective rates, at what time will Abby have typed exactly 200 more words than Bobby?

A. 1:40 PM
B. 1:50 PM
C. 2:00 PM
D. 2:10 PM
E. 2:20 PM
Show more

Say time needed for Abby to type 200 more words than Bobby is t. In that time she would type 80t words and Bobby would type 60t words.

Now, total words typed by Bobby would be 600+60t and we want that number to be 200 less than 80t: 600+60t=80t-200 --> t=40.

1:30 PM + 40 minutes = 2:10 PM.

Answer: D.
avatar
stevie1111
avatar
Joined: 19 Aug 2011
Last visit: 31 Aug 2012
Posts: 14
Own Kudos:
57
 [17]
Given Kudos: 2
Concentration: Finance, Entrepreneurship
Posts: 14
Kudos: 57
 [17]
Abby and Bobby type at constant rates of 80 words per minute 16 Apr 2012, 05:56
14
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
Abby needs to type 200 words more than Bobby. i.e it has to type 800 words more as it starts behind by 600 words.
It covers up 20 (80-60) words in 1 min.
Hence time required to cover up 800 words = 800/20 = 40 min.
i.e. 1.30 pm + 40 = 2.10 pm
General Discussion
avatar
harshavmrg
avatar
Joined: 25 Feb 2010
Last visit: 06 Dec 2012
Posts: 102
Own Kudos:
296
 [2]
Given Kudos: 16
Status:I will not stop until i realise my goal which is my dream too
Schools: Johnson '15
Schools: Johnson '15
Posts: 102
Kudos: 296
 [2]
Abby and Bobby type at constant rates of 80 words per minute 15 Apr 2012, 22:02
1
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
Bunuel
calreg11
Abby and Bobby type at constant rates of 80 words per minute and 60 words per minute, respectively. Bobby begins typing before Abby and has typed 600 words when Abby begins typing at 1:30 pm. If they continue typing at their respective rates, at what time will Abby have typed exactly 200 more words than Bobby?

A. 1:40 PM
B. 1:50 PM
C. 2:00 PM
D. 2:10 PM
E. 2:20 PM

Say time needed for Abby to type 200 more words than Bobby is t. In that time she would type 80t words and Bobby would type 60t words.

Now, total words typed by Bobby would be 600+60t and we want that number to be 200 less than 80t: 600+60t=80t-200 --> t=40.

1:30 PM + 40 minutes = 2:10 PM.

Answer: D.
Show more


Nice explanation Bunuel... ur methods are most of the time the simplest and easier-to-follow..thanks for that once again
User avatar
ENAFEX
User avatar
Joined: 03 Aug 2010
Last visit: 25 Oct 2012
Posts: 84
Own Kudos:
280
 [4]
Given Kudos: 20
Status:And the Prep starts again...
Concentration: IT Consulting
GMAT 1: 490 Q42 V17
Posts: 84
Kudos: 280
 [4]
Abby and Bobby type at constant rates of 80 words per minute 17 Apr 2012, 21:13
4
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Lets take the time required as 't'

So, words typed by Abby-words typed by Bobby = 200
ie. 80t - (60t+600)=200

80t-60t-600=200
20t=800
t=40 min

1:30 PM +40 Min = 2:10 PM

D
User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
 [8]
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
 [8]
Abby and Bobby type at constant rates of 80 words per minute 02 Sep 2012, 07:07
6
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
This question can be solved easily using relative speed
Relative speed of Abby over booby = 20 words/min
Extra work needed to be done by abby = 600+ 200 = 800 words
Time take by abby to write extra 800 words = 800/20 = 40 min
User avatar
mbaiseasy
User avatar
Joined: 13 Aug 2012
Last visit: 29 Dec 2013
Posts: 316
Own Kudos:
2,095
Given Kudos: 11
Concentration: Marketing, Finance
Schools: Full Time MBA (A$)
GPA: 3.23
Schools: Full Time MBA (A$)
Posts: 316
Kudos: 2,095
Abby and Bobby type at constant rates of 80 words per minute 15 Nov 2012, 06:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Output of B = Output of A - 200

60t + 600 = 80t - 200
20t =800

t = 40 minutes
avatar
adityag85
avatar
Joined: 16 Mar 2012
Last visit: 28 May 2015
Posts: 12
Own Kudos:
68
 [4]
Given Kudos: 6
Schools: Mays Business School - Class of 2016
Schools: Mays Business School - Class of 2016
Posts: 12
Kudos: 68
 [4]
Abby and Bobby type at constant rates of 80 words per minute 08 Dec 2012, 08:56
4
Kudos
Add Kudos
Bookmarks
Bookmark this Post
B's elapsed time for typing 600 words: 600/60 = 10 min (No. of words typed by B/Rate of B)
A can type 800 words every 10 min; ( Rate of A x Time = 80 x 10)

At 1:30 if A also starts typing with 800 words/min.


Number of words typed by A and B in 10 min intervals
At 1:20
A=0; B=0

At 1:30
A=0; B=600

At 1:40
A=800; B=1200

At 1:50
A=1600; B=1800

At 2:00
A= 2400; B= 2400

At 2:10
A=3200; B=3000
User avatar
TGC
User avatar
Joined: 03 Aug 2012
Last visit: 19 Jul 2017
Posts: 572
Own Kudos:
3,621
 [4]
Given Kudos: 322
Concentration: General Management, General Management
Schools: ISB '16 NUS '17 NTU '17 XLRI SMU '17 IIM Lucknow IPMX'16 (A)
GMAT 1: 630 Q47 V29
GMAT 2: 680 Q50 V32
GPA: 3.7
WE:Information Technology (Finance: Investment Banking)
Schools: ISB '16 NUS '17 NTU '17 XLRI SMU '17 IIM Lucknow IPMX'16 (A)
GMAT 2: 680 Q50 V32
Posts: 572
Kudos: 3,621
 [4]
Abby and Bobby type at constant rates of 80 words per minute 29 Mar 2014, 03:34
4
Kudos
Add Kudos
Bookmarks
Bookmark this Post
This one is a classic Rate work and Rate distance time problem.

Rate(A) = 80
Rate(B) = 60

B starts at 01:30 and completes 600 words.

To be 200 words ahead of B, A will have to cover the distance of 600 + 200.

Total Distance = 800
Total speed = Relative speed = 80-60

800/20 = 40 minutes

01:30 + 40 = 02:10
avatar
sjavvadi
avatar
Joined: 03 Oct 2013
Last visit: 24 May 2018
Posts: 55
Own Kudos:
80
Given Kudos: 16
Posts: 55
Kudos: 80
Abby and Bobby type at constant rates of 80 words per minute 21 Nov 2016, 10:54
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Let T be the time after 1:30 PM.

In this time if Bobby typed 'x' words, Abby should have typed 600+x+200 i.e. '800+x' words.

Time is same so Words_bobby/Rate_Bobby = W_Abby/Rate_Abby.

x/60 = 800+x/80 => x = 2400 words.

Therefore T = 2400/60 or 3200/80 which gives T = 40 mins = 2:10 PM
User avatar
Sri07
User avatar
Joined: 27 Jun 2019
Last visit: 30 Aug 2021
Posts: 42
Own Kudos:
9
 [1]
Given Kudos: 166
Posts: 42
Kudos: 9
 [1]
Abby and Bobby type at constant rates of 80 words per minute 08 Aug 2020, 09:31
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hey,


Difference between their reading speeds: 20 Words p/m

Abby already typed 600 words
So to cover abby + type 200 more words
Bobby will have to type 800 words

800/20 = 40 mins
1:30 +40 mins = 2:10 pm
User avatar
Ghoskrp3
User avatar
Joined: 15 Jul 2024
Last visit: 18 Aug 2025
Posts: 36
Own Kudos:
10
Given Kudos: 57
Location: India
Posts: 36
Kudos: 10
Abby and Bobby type at constant rates of 80 words per minute 01 Apr 2025, 06:34
Kudos
Add Kudos
Bookmarks
Bookmark this Post
If Abby types at 80wpm then in 'x' mins words typed => 80x
Similarly, Bobby will type => 60x words in 'x' mins

so if you want Abby to type 200 more than Bobby in a given time where Bobby had already started with a head start of 600 words then the equation would look as below:

80x = 600 + 60x + 200 (600 words HeadStart & 200 more words to be typed by Abby in the future)
=> 20x = 800
=> x = 40mins

if started at 1:30, thenit should conclude by 2:10pm!

D. 2:10 PM
User avatar
Varun0902
User avatar
Joined: 18 Jan 2026
Last visit: 23 Apr 2026
Posts: 46
Own Kudos:
2
Given Kudos: 47
Products:
Forum Quiz
Posts: 46
Kudos: 2
Abby and Bobby type at constant rates of 80 words per minute 14 Mar 2026, 04:47
Kudos
Add Kudos
Bookmarks
Bookmark this Post
80x = 600+ 200 + 60x
20x = 800
x= 40 min after 1:30 i.e. 2:10
Moderators:
Bunuel
Math Expert
109785 posts
Krunaal
Tuck School Moderator
853 posts