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# Machine A can do a job in 12 hours at a constant rate

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Intern
Joined: 15 Jun 2018
Posts: 15
Location: India
Concentration: Finance, Strategy
GPA: 3.45
WE: Asset Management (Commercial Banking)
Machine A can do a job in 12 hours at a constant rate  [#permalink]

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09 Jul 2018, 03:42
2
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Difficulty:

(N/A)

Question Stats:

100% (01:19) correct 0% (00:00) wrong based on 2 sessions

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Machine A can do a job in 12 hours at a constant rate and Machine B can do the same job at a 1/5 constant rate of machine A. If machine A does 3/4 of the job and then machine B do the rest of the job, what is the total amount of hours done by machine A and machine B?

(A) 18 hours
(B) 20 hours
(C) 24 hours
(D) 28 hours
(E) 30 hours
Math Expert
Joined: 02 Sep 2009
Posts: 52210
Re: Machine A can do a job in 12 hours at a constant rate  [#permalink]

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09 Jul 2018, 03:47
CaptainGMAT wrote:
Machine A can do a job in 12 hours at a constant rate and Machine B can do the same job at a 1/5 constant rate of machine A. If machine A does 3/4 of the job and then machine B do the rest of the job, what is the total amount of hours done by machine A and machine B?

(A) 18 hours
(B) 20 hours
(C) 24 hours
(D) 28 hours
(E) 30 hours

Discussed here: https://gmatclub.com/forum/machine-a-ca ... 64442.html
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Re: Machine A can do a job in 12 hours at a constant rate &nbs [#permalink] 09 Jul 2018, 03:47
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