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Rate Problem from GMAT Prep

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Master | Next Rank: 500 Posts
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Rate Problem from GMAT Prep

by rosh26 » Tue Jun 10, 2008 3:13 pm
Each of 10 machines works at a constant rate to do a certain job. The amount of time needed by the 10 machines working together is 16 hours.

How many hours would be needed if only 8 machines, working together, were used to complete the job?

Answer is 20

How did they get this answer???
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Master | Next Rank: 500 Posts
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by egybs » Tue Jun 10, 2008 3:37 pm
see my explanation here:
https://www.beatthegmat.com/rate-problem ... 12130.html
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