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what is the answer for this work problem

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rehab-299
 Post subject: what is the answer for this work problem
 Post Posted: Sun Oct 25, 2009 3:05 pm 
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Students


Posts: 5
if X worked alone to take him 15 hours then y independently for18 hours if x alone to do first for 6 hours, two people were doing together for three hours, rest of job will be finished by y , and then y need how many hours to coplete?
A)13/3hours B)17/3hours C)13/5hours D)16/3 hours D)16/5 hours e)21/5 hours
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2amitprakash
 Post subject: Re: what is the answer for this work problem
 Post Posted: Sun Oct 25, 2009 5:57 pm 
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Course Students


Posts: 26
With few assumptions about spellings! Find the rates:
X - 1/15 of work in 1 hour
Y - 1/18 of work in 1 hour
So X+Y - (1/15 + 1/18 = 11/90) in 1 hour

Now how much work is done:
X did 6/15
X+Y did 11/30
Remaining work = 1-(6/15+11/30) = 7/30

So Y will take 18*7/30 = 21/5 hours. (E)
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Ben Ku
 Post subject: Re: what is the answer for this work problem
 Post Posted: Thu Nov 19, 2009 4:21 am 
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ManhattanGMAT Staff


Posts: 823
Can you please re-type the question with the EXACT wording? It's unclear what is being stated in the question you posted. Thanks.

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Ben Ku
Instructor
ManhattanGMAT
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