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Factory line A assembles materials and makes leather bags at a rate of
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Updated on: 19 Aug 2019, 03:15
Question Stats:
62% (01:29) correct 38% (01:45) wrong based on 93 sessions
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Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes after line B started production, will the two factory line have produced the same number of leather bags? (A) 5 (B) 11 (C) 250 (D) 300 (E) 360
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Originally posted by EncounterGMAT on 31 Jul 2019, 01:19.
Last edited by Bunuel on 19 Aug 2019, 03:15, edited 2 times in total.



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Re: Factory line A assembles materials and makes leather bags at a rate of
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31 Jul 2019, 01:36
A—25 bags/hour B—30 bags/hour
A started producing an hour earlier than B
25t+ 25= 30t t = 5 hours 5 *60 minutes = 300
The answer choice is D
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Re: Factory line A assembles materials and makes leather bags at a rate of
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04 Aug 2019, 23:35
Answer can be solved by logic.
The first machine starts its production an hour prior to the second machine but is comparatively slower than the second one. At 6 hours, Machine A would have produced 25x6= 150 Machine B having started an hour later would have produced only for 5 hours, 5x30=150
So at 360 minutes both the machine would have the same production.



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Re: Factory line A assembles materials and makes leather bags at a rate of
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06 Aug 2019, 08:38
lacktutor wrote: A—25 bags/hour B—30 bags/hour
A started producing an hour earlier than B
25t+ 25= 30t t = 5 hours 5 *60 minutes = 300
The answer choice is D
Posted from my mobile device Hi lacktutor, Why is the answer not coming this way 25t= 30(t1) 25t=30t30 5t=30 ,t=6 Shouldn't the answer come this way too.
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Re: Factory line A assembles materials and makes leather bags at a rate of
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06 Aug 2019, 09:16
stne wrote: lacktutor wrote: A—25 bags/hour B—30 bags/hour
A started producing an hour earlier than B
25t+ 25= 30t t = 5 hours 5 *60 minutes = 300
The answer choice is D
Posted from my mobile device Hi lacktutor, Why is the answer not coming this way 25t= 30(t1) 25t=30t30 5t=30 ,t=6 Shouldn't the answer come this way too. Why not?? But, you need to calculate it correctly. The question is asking the total time after B starts, not A. In your case, (t1) is the right one. —> 61=5 or 300 minutes. Hope it helps



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Re: Factory line A assembles materials and makes leather bags at a rate of
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06 Aug 2019, 10:38
lacktutor wrote: stne wrote: lacktutor wrote: A—25 bags/hour B—30 bags/hour
A started producing an hour earlier than B
25t+ 25= 30t t = 5 hours 5 *60 minutes = 300
The answer choice is D
Posted from my mobile device Hi lacktutor, Why is the answer not coming this way 25t= 30(t1) 25t=30t30 5t=30 ,t=6 Shouldn't the answer come this way too. Why not?? But, you need to calculate it correctly. The question is asking the total time after B starts, not A. In your case, (t1) is the right one. —> 61=5 or 300 minutes. Hope it helps Hi lacktutor, Where in the question does it say total time taken by B?
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Re: Factory line A assembles materials and makes leather bags at a rate of
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06 Aug 2019, 11:10
The relative rate of Factory B is (30  25) = 5 bags/hr and Since the factory B starts after an hour it justs have to outweight whatever A made in an hour which is 25 bags So 25/rel rate = 25/5 = 5 hrs = 300 min.



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Re: Factory line A assembles materials and makes leather bags at a rate of
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06 Aug 2019, 12:15
DarshanK, since the question asks "In how many minutes" it implies that it is asking only for the time from 'now', which is when B starts running. Thus, it's not the total time but t1hr or 300 minutes. It could be written more clearly.



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Re: Factory line A assembles materials and makes leather bags at a rate of
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11 Aug 2019, 19:49
EncounterGMAT wrote: Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes will the two factory line have produced the same number of leather bags? (A) 5 (B) 11 (C) 250 (D) 300 (E) 360 Let n = the number of hours that line B has been in production. Since line A started production 1 hour prior to line B, its time in production is n + 1 hours. We can use the equation: 25(n + 1) = 30n 25n + 25 = 30n 25 = 5n 5 = n So, the same number of bags are produced in 5 x 60 = 300 minutes. Answer: D
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Re: Factory line A assembles materials and makes leather bags at a rate of
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11 Aug 2019, 20:12
ScottTargetTestPrep wrote: EncounterGMAT wrote: Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes will the two factory line have produced the same number of leather bags? (A) 5 (B) 11 (C) 250 (D) 300 (E) 360 Let n = the number of hours that line B has been in production. Since line A started production 1 hour prior to line B, its time in production is n + 1 hours. We can use the equation: 25(n + 1) = 30n 25n + 25 = 30n 25 = 5n 5 = n So, the same number of bags are produced in 5 x 60 = 300 minutes. Answer: D Hi, As per the below solution, U have calculater the number of hrs B take, but in question its talking about the number of hrs two factory lines will take. So if we calculate the numbers of factory line A has worked is 360 mins. Seems like this question is poorely written. Both 360 and 300 can be the ans depending upon the inference of a test taker Posted from my mobile device



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Re: Factory line A assembles materials and makes leather bags at a rate of
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19 Aug 2019, 03:09
vishumangal wrote: ScottTargetTestPrep wrote: EncounterGMAT wrote: Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes will the two factory line have produced the same number of leather bags? (A) 5 (B) 11 (C) 250 (D) 300 (E) 360 Let n = the number of hours that line B has been in production. Since line A started production 1 hour prior to line B, its time in production is n + 1 hours. We can use the equation: 25(n + 1) = 30n 25n + 25 = 30n 25 = 5n 5 = n So, the same number of bags are produced in 5 x 60 = 300 minutes. Answer: D Hi, As per the below solution, U have calculater the number of hrs B take, but in question its talking about the number of hrs two factory lines will take. So if we calculate the numbers of factory line A has worked is 360 mins. Seems like this question is poorely written. Both 360 and 300 can be the ans depending upon the inference of a test taker Posted from my mobile deviceHi vishumangal, You are correct That was precisely my query, one should be honest about one's reply rather than formulate the explanation to suit the OA. IMO there is no way we can be sure whether total time from beginning or time taken after B starts , is being asked for here. if any moderator can correct me , I would be grateful.
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Re: Factory line A assembles materials and makes leather bags at a rate of
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19 Aug 2019, 03:17
stne wrote: vishumangal wrote: ScottTargetTestPrep wrote: Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes will the two factory line have produced the same number of leather bags? (A) 5 (B) 11 (C) 250 (D) 300 (E) 360
Let n = the number of hours that line B has been in production. Since line A started production 1 hour prior to line B, its time in production is n + 1 hours. We can use the equation:
25(n + 1) = 30n
25n + 25 = 30n
25 = 5n
5 = n
So, the same number of bags are produced in 5 x 60 = 300 minutes.
Answer: D Hi, As per the below solution, U have calculater the number of hrs B take, but in question its talking about the number of hrs two factory lines will take. So if we calculate the numbers of factory line A has worked is 360 mins. Seems like this question is poorely written. Both 360 and 300 can be the ans depending upon the inference of a test taker Posted from my mobile deviceHi vishumangal, You are correct That was precisely my query, one should be honest about one's reply rather than formulate the explanation to suit the OA. IMO there is no way we can be sure whether total time from beginning or time taken after B starts , is being asked for here. if any moderator can correct me , I would be grateful. Edited the stem to make the question less ambiguous. Hope now the question is fine.
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Re: Factory line A assembles materials and makes leather bags at a rate of
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19 Aug 2019, 03:52
Bunuel wrote: stne wrote: vishnumangal wrote: Hi,
As per the below solution, U have calculater the number of hrs B take, but in question its talking about the number of hrs two factory lines will take.
So if we calculate the numbers of factory line A has worked is 360 mins.
Seems like this question is poorely written.
Both 360 and 300 can be the ans depending upon the inference of a test taker You are correct That was precisely my query, one should be honest about one's reply rather than formulate the explanation to suit the OA. IMO there is no way we can be sure whether total time from beginning or time taken after B starts , is being asked for here. if any moderator can correct me , I would be grateful. Edited the stem to make the question less ambiguous. Hope now the question is fine. Thank you sir, now everything looks awesome!
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Re: Factory line A assembles materials and makes leather bags at a rate of
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19 Aug 2019, 05:10
EncounterGMAT wrote: Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes after line B started production, will the two factory line have produced the same number of leather bags?
(A) 5 (B) 11 (C) 250 (D) 300 (E) 360 from given info we have 25*(x+1)=30x x= 5 hrs or say 300 mins IMO D
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Re: Factory line A assembles materials and makes leather bags at a rate of
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19 Aug 2019, 05:15
EncounterGMAT wrote: Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes after line B started production, will the two factory line have produced the same number of leather bags?
(A) 5 (B) 11 (C) 250 (D) 300 (E) 360 Let the time after line B started production, will the two factory line have produced the same number of leather bags = x hours 30x = 25x + 25 5x = 25 x = 5 hours = 300 minutes IMO D
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Re: Factory line A assembles materials and makes leather bags at a rate of
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19 Aug 2019, 11:54
EncounterGMAT wrote: Factory line A assembles materials and makes leather bags at a rate of 25 bags/hour. Exactly an hour later, factory line B starts production of leather bags at a rate of 30 bags/hour. In how many minutes after line B started production, will the two factory line have produced the same number of leather bags?
(A) 5 (B) 11 (C) 250 (D) 300 (E) 360 B is making 5 more than A. A is already ahead in the game with 25 bags. B will take 5 hours to make those 25 bags. 5 hours is 300 minutes. Hence D
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