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

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Joined: 21 Jun 2014
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Location: India
Concentration: General Management, Technology
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WE: Information Technology (Computer Software)
Jim can assemble b crates an hour and Robert can assemble 2b crates in  [#permalink]

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10 Mar 2017, 22:14
1
00:00

Difficulty:

5% (low)

Question Stats:

89% (00:31) correct 11% (00:54) wrong based on 46 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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10 Mar 2017, 22:27
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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10 Mar 2017, 23:50
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  [#permalink]

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16 Dec 2018, 13:30
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Re: Jim can assemble b crates an hour and Robert can assemble 2b crates in &nbs [#permalink] 16 Dec 2018, 13:30
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