SOLUTION: Shawna can pour a large concrete driveway in six hours. Dan can pour the same driveway in seven hours. Find how long it would take them if they worked together.

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Shawna can pour a large concrete driveway in six hours. Dan can pour the same driveway in seven hours. Find how long it would take them if they worked together.      Log On


   

Question 446975: Shawna can pour a large concrete driveway
in six hours. Dan can pour the same
driveway in seven hours. Find how long it
would take them if they worked together.
Answer by rwm(914) About Me  (Show Source):
You can put this solution on YOUR website!
How many times can you pour the same driveway?
x/6+x/7=1
7x+6x=42
13x=42
x=42/13=3.23 hours