Homework Help: College Algebra

Posted by Laowe on Saturday, September 10, 2011 at 6:05pm.

It takes Todd 3 hours longer than Tom to paint a 4x5 feet bedroom. Working together, both can complete the job in two hours.How long does it take each one to complete the painting job working alone?

College Algebra - Mgraph, Saturday, September 10, 2011 at 10:21pm
Let it takes Todd X hours; Tom Y hours.
X=Y+3
For one hour, Todd paints 1/X part of the bedroom, Tom - 1/Y; together - 1/X+1/Y

1/(1/X+1/Y)=2
2(X+Y)=XY
2(2Y+3)=(Y+3)Y
4Y+6=Y^2+3Y
Y^2-Y-6=0 => Y=3, X=6

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