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


Let's apply some logic to solve this question

Given: Jim can assemble b crates in 1 hour
So: Jim can assemble 2b crates in 2 hours [if we double the work time, we double the output]
So: Jim can assemble 4b crates in 4 hours [if we double the work time (again), we double the output]

Given: Robert can assemble 2b crates in 1 hour
So: Robert can assemble 4b crates in 2 hours [if we double the work time, we double the output]
So: Robert can assemble 8b crates in 4 hours [if we double the work time (again), we double the output]

So, when we COMBINE their efforts, we add their 4-hour OUTPUTS
That is, TOTAL output = color=red]4b[/color] + color=red]8b[/color] = 12b

Answer: D

Cheers,
Brent
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Re: Jim can assemble b crates an hour and Robert can assemble 2b crates in [#permalink]
Expert Reply
Bunuel 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


In 4 hours Jim and Robert can assemble b x 4 + 2b x 4 = 12b crates.

Answer: D

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