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The minutes that it takes machine A to print n pages alone is half a m

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The minutes that it takes machine A to print n pages alone is half a m  [#permalink]

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New post Updated on: 01 Dec 2019, 07:04
00:00
A
B
C
D
E

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  45% (medium)

Question Stats:

60% (01:23) correct 40% (02:25) wrong based on 25 sessions

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The minutes that it takes machine A to print n pages alone is half a minute that it takes machine B to print n pages alone. If machine A and machine B print n pages in 3 minutes when working together at their constant rates, respectively, in how many minutes machine B prints n pages alone?

A. 3.2 min
B. 3.6 min
C. 4.0 min
D. 4.5 min
E. 9.0 min

Originally posted by indu1954 on 01 Dec 2019, 07:01.
Last edited by Bunuel on 01 Dec 2019, 07:04, edited 1 time in total.
Renamed the topic and edited the question.
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Re: The minutes that it takes machine A to print n pages alone is half a m  [#permalink]

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New post 01 Dec 2019, 08:04
Time taken A:B = 1/2 : 1
so, Efficiency = 2:1
Total efficiency = 2+1= 3
so, total work = 3 minutes * 3 efficiency = 9
As, B's efficiency is 1, time taken by B is 9/1 = 9 minutes.
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Re: The minutes that it takes machine A to print n pages alone is half a m  [#permalink]

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New post 10 Dec 2019, 06:49
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Do I have to master such questions to reach a level above 600 ?
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Re: The minutes that it takes machine A to print n pages alone is half a m   [#permalink] 10 Dec 2019, 06:49
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The minutes that it takes machine A to print n pages alone is half a m

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