SOLUTION: Glenn can paint a classroom in 5 hours. His father can do it in 4 hours. How long will it take them if they work together?
Algebra.Com
Question 909184: Glenn can paint a classroom in 5 hours. His father can do it in 4 hours. How long will it take them if they work together?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
1/a+1/b=1/x
1/4+1/5=1/x
5/20+4/20=1/x
9/20=1/x
x=20/9 hours working together
x=2.22222222 hours working together
check
x/a+x/b=1
(20/9)/4+(20/9)/5=1
5/9+4/9=1
1.0=1
ok
RELATED QUESTIONS
Glenn can paint a room in five hours . His father can do it in four hours. How long will... (answered by macston)
Sarah can paint a fence in 4 hours . her father can paint it in 2 hours . if they work... (answered by schmidtmomto6)
Sarah can paint a fence in 4 hours. Her father Joe can paint it in 2 hours. If they work... (answered by ptaylor)
A man can paint a room, working alone, in 5 hours. His wife can do the same job in 4... (answered by solver91311)
Jim can paint the fence in 5 hours, while Julie can paint it in 4 hours. How long will it (answered by josmiceli)
Art can paint a set of kitchen cabinets in 3 hours. His father can do it in 1 hour. How... (answered by bostonmathtutor)
Alice can paint the house in 5 hours, and Bob can paint it in 7 hours. How long will it... (answered by ewatrrr)
One painter can paint a room in 5
hours. Another painter can finish
the job in 8 hours. (answered by solver91311)
John can paint his room in 5 hours; Toby can paint the same room in 8 hours. How long... (answered by ewatrrr,josmiceli)