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Question 891755: 8 people require 10 hours to complete a job. How many hours will it take 5 people to complete half the job, if they work at the same rate?
Answer by josmiceli(19441)   (Show Source):
You can put this solution on YOUR website! 8 people require 10 hours to complete a job.
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1 person will take 8 times as long to do the same job, so
1 person takes 80 hours to complete the job
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5 people will take 1/5 that time to do the same job, so
5 people take 16 hours to complete the job
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5 people take 1/2 that time to do 1/2 of the job, so
5 people take 8 hours to do 1/2 of a job
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