SOLUTION: if barbara were to paint her living room alone it would take her 3 hours. her sister denise could do the job in 5 hours. how long would it take them working together

Algebra ->  Rate-of-work-word-problems -> SOLUTION: if barbara were to paint her living room alone it would take her 3 hours. her sister denise could do the job in 5 hours. how long would it take them working together      Log On


   

Question 349817: if barbara were to paint her living room alone it would take her 3 hours. her sister denise could do the job in 5 hours. how long would it take them working together
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
1/3+1/5=1/X
(5+3)/(3*5)=1/X
8/15=1/X CROSS MULTIPLY.
8X=15
X=15/8
X=1.875 HOURS WORKING TOGETHER.