Question 380382
 Sammy can complete a programming job in 8 hours if he works alone.
So he does 1/8 of the job in 1 hour
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Marilyn can complete the same programming job in 12 hours if she works alone
Marilyn can do 1/12 of the job in 1 hour.
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Together they can do 1/8 +1/2 of the job in 1 hour
=(3+2)/24
=5/24 of the job in 1 hour
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so they will take 24/5 hours to do the job
=4.8 hours
=4hours +0.8*60minutes
=4hours +48 minutes
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m.ananth@hotmail.ca