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Jim can assemble b crates an hour and Robert can assemble 2b crates in

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Jim can assemble b crates an hour and Robert can assemble 2b crates in  [#permalink]

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New post 10 Mar 2017, 23:14
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

94% (00:40) correct 6% (00:52) wrong based on 27 sessions

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Jim can assemble b crates an hour and Robert can assemble 2b crates in an hour. Working together at this rate, how many crates can they assemble in four hours?

A) 3b

B) 6b

C) 8b

D) 12b

E) 18b

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Re: Jim can assemble b crates an hour and Robert can assemble 2b crates in  [#permalink]

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New post 10 Mar 2017, 23:27
HKD1710 wrote:
Jim can assemble b crates an hour and Robert can assemble 2b crates in an hour. Working together at this rate, how many crates can they assemble in four hours?

A) 3b

B) 6b

C) 8b

D) 12b

E) 18b


Jim- b crates per hour
Rob - 2b crates per hour
J+R 3b crates per hour
in 4 hours 12b crates
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Re: Jim can assemble b crates an hour and Robert can assemble 2b crates in  [#permalink]

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New post 11 Mar 2017, 00:50
HKD1710 wrote:
Jim can assemble b crates an hour and Robert can assemble 2b crates in an hour. Working together at this rate, how many crates can they assemble in four hours?

A) 3b

B) 6b

C) 8b

D) 12b

E) 18b


Jim's efficiency = b units/hr
Robert 's efficiency = 2b units/hr

Together Jim's & Robert's efficiency is 3b units/hr

So, The total number of crates ssembled in four hours is 12b units...

Thus, answer must be (D) 12b Units...
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Re: Jim can assemble b crates an hour and Robert can assemble 2b crates in &nbs [#permalink] 11 Mar 2017, 00:50
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