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On Thursday afternoon, two machines, J and R, ran continuously at unif

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On Thursday afternoon, two machines, J and R, ran continuously at unif [#permalink]

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New post 29 Mar 2017, 04:00
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On Thursday afternoon, two machines, J and R, ran continuously at uniform rates to fill a production order. At what time did they completely fill the order?

(1) Both machines run at the same rate.
(2) The machines had filled 1/2 of the order by 2 p.m and 5/6 of the order by 2:20 p.m.
[Reveal] Spoiler: OA

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Re: On Thursday afternoon, two machines, J and R, ran continuously at unif [#permalink]

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New post 29 Mar 2017, 06:02
Bunuel wrote:
On Thursday afternoon, two machines, J and R, ran continuously at uniform rates to fill a production order. At what time did they completely fill the order?

(1) Both machines run at the same rate.
(2) The machines had filled 1/2 of the order by 2 p.m and 5/6 of the order by 2:20 p.m.



statement 1 gives us no information regarding start time or end time or rate so not sufficient
statement 2: take total work to be 12. now we know by 2 p.m we do 6 units of work and by 2:20 pm we do 10 units of work. so 4 units of work are done in 20 mins so time required to do remaining 2 units of work= 20/4*2 = 10 mins. so the work will be completed by 2:30. statement 2 is sufficient.
Re: On Thursday afternoon, two machines, J and R, ran continuously at unif   [#permalink] 29 Mar 2017, 06:02
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On Thursday afternoon, two machines, J and R, ran continuously at unif

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