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

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

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New post 09 Jul 2018, 04:42
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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
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Re: Machine A can do a job in 12 hours at a constant rate  [#permalink]

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New post 09 Jul 2018, 04:47
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, 04:47
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