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Retake_GMAT · 07-21-2008, 04:04 AM

Since rate of all machines are same, time is also same. let x be the time taken to do the job.

1/k = 1/x + 1/x = 2/x.........eq 1

1/(k -2) = 3/x...................eq2

In eq2 put x=2k.

we get k=6

07-21-2008, 04:04 AM	#7 (permalink)
Retake_GMAT Chill Join Date: May 2008 Location: India, Bangalore Posts: 862	Since rate of all machines are same, time is also same. let x be the time taken to do the job. 1/k = 1/x + 1/x = 2/x.........eq 1 1/(k -2) = 3/x...................eq2 In eq2 put x=2k. we get k=6