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Abby and Bobby type at constant rates of 80 words per minute

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Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 15 Apr 2012, 15:45
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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
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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 15 Apr 2012, 15:58
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calreg11 wrote:
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.
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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 15 Apr 2012, 21:02
Bunuel wrote:
calreg11 wrote:
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.



Nice explanation Bunuel... ur methods are most of the time the simplest and easier-to-follow..thanks for that once again
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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 16 Apr 2012, 04:56
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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
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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 17 Apr 2012, 20:13
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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

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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 02 Sep 2012, 06:07
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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
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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 15 Nov 2012, 05:08
Output of B = Output of A - 200

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

t = 40 minutes
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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 08 Dec 2012, 07:56
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
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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 17 Dec 2013, 19:11
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Re: Abby and Bobby type at constant rates of 80 words per minute [#permalink] New post 29 Mar 2014, 02:34
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
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Re: Abby and Bobby type at constant rates of 80 words per minute   [#permalink] 29 Mar 2014, 02:34
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