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by dagestan1980 » Sun Jan 28, 2007 4:58 pm
I am studying for GMAT and I have come upon a problem I simple can't understand. Please, help:

If Carol can finish a job in 5 hours and Steve can finish the same job in 10 hours, how many minutes will it take both of them together to finish the job?
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by beatthegmat » Sun Jan 28, 2007 5:10 pm
Hi dagestan:

There's a good technique for these kinds of problems. Please check out page 50 of my GMAT Flashcards: https://www.beatthegmat.com/viewtopic.php?t=32

Best of luck!
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by maxim730 » Tue Jan 30, 2007 9:09 am
The formula is simply: 1/a + 1/b = 1/r

a = time of person A

b = time of person B

r = combined time

1/a = rate of person a; 1/b = rate of person b

1 is the "work" that they are doing, it could be building 25 boxes or painting a wall, or building 200 cars.
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by gmat765 » Wed Apr 16, 2008 6:58 pm
The answer is 1/(1/5+1/10)
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