SOLUTION: Doug can deliver his pspers in 45 minutes. If Meg helps, they can finish in 20 minutes. How long will it take Meg to work alone?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Doug can deliver his pspers in 45 minutes. If Meg helps, they can finish in 20 minutes. How long will it take Meg to work alone?      Log On


   

Question 38274: Doug can deliver his pspers in 45 minutes. If Meg helps, they can finish in 20 minutes. How long will it take Meg to work alone?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
The normal equation for this kind of equation is
t/A + t/B = 1
where t is the time working together
A is the time it takes the first person working alone
B is the time it takes the second person working alone
and the 1 represents one whole job to do...
Now plug in and solve for B
20/45 + 20/B = 1
multiply all by 45B to clear fractions
20B + 900 = 45B
900 = 25B
B = 36 minutes