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27 May 2022, 08:15
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
74% (02:22) correct
26%
(02:03)
wrong
based on 34
sessions
History
Date
Time
Result
Not Attempted Yet
A can do 50% more work as B can do in the same time. B alone can do a piece of work in 20 h. A, with the help of B, can finish the same work in how many hours ?
(A) 13 1/3 hours
(B) 12 hours
(C) 8 hours
(D) 5 1/2 hours
(E) 5 hours
(A) 13 1/3 hours
(B) 12 hours
(C) 8 hours
(D) 5 1/2 hours
(E) 5 hours
Updated on: 27 May 2022, 09:11
Originally posted by ThatDudeKnows on 27 May 2022, 08:26.
Last edited by ThatDudeKnows on 27 May 2022, 09:11, edited 1 time in total.
Last edited by ThatDudeKnows on 27 May 2022, 09:11, edited 1 time in total.
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Bunuel
A can do 50% more work as B can do in the same time. B alone can do a piece of work in 20 h. A, with the help of B, can finish the same work in how many hours ?
(A) 13 1/3 hours
(B) 12 hours
(C) 8 hours
(D) 5 1/2 hours
(E) 5 hours
(A) 13 1/3 hours
(B) 12 hours
(C) 8 hours
(D) 5 1/2 hours
(E) 5 hours
On rates questions that don't tell you what the job is, rather than working with fractional jobs, the best approach is to just make up some definition of the job (I call these "Hidden Plug Ins"). Let's make this one solving 40 GMAT questions. B can do it in 20 hours, so B can solve 2 questions per hour. A works 50% faster, so A can solve 3 questions per hour. A and B together can solve 5 questions per hour. How long does it take them to solve 40 questions? 40/5 = 8
Answer choice C.
ThatDudeKnowsHiddenPlugIn
ThatDudeKnowsRates
Rohstar750
Joined: 01 Mar 2022
Last visit: 23 Nov 2024
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Concentration: Strategy, Leadership
Schools: Schulich Sep'22 Intake (S) Rotman '25 (S)
GPA: 3.7
WE:Engineering (Consulting)
27 May 2022, 08:50
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ThatDudeKnows
Bunuel
A can do 50% more work as B can do in the same time. B alone can do a piece of work in 20 h. A, with the help of B, can finish the same work in how many hours ?
(A) 13 1/3 hours
(B) 12 hours
(C) 8 hours
(D) 5 1/2 hours
(E) 5 hours
(A) 13 1/3 hours
(B) 12 hours
(C) 8 hours
(D) 5 1/2 hours
(E) 5 hours
On rates questions that don't tell you what the job is, rather than working with fractional jobs, the best approach is to just make up some definition of the job (I call these "Hidden Plug Ins"). Let's make this one solving 40 GMAT questions. B can do it in 20 hours, so B can solve 2 questions per hour. A works 50% faster, so A can solve 3 questions per hour. How long does it take A to solve 40 questions? 40/3 = 13.333
Answer choice A.
ThatDudeKnowsHiddenPlugIn
ThatDudeKnowsRates
Hi,
I belive we have to find combined hours of A and B to do the work that B completes in 20 hours.
Correct me If I misunderstood the question.
Posted from my mobile device
