SOLUTION: The officejet printer can copy Janet's dissertaion in 14 min. The laserjet printer can copy the same document in 8 min. IF the two machines work together how long would they tak

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: The officejet printer can copy Janet's dissertaion in 14 min. The laserjet printer can copy the same document in 8 min. IF the two machines work together how long would they tak      Log On


   

Question 282363: The officejet printer can copy Janet's dissertaion in 14 min. The laserjet printer can copy the same document in 8 min. IF the two machines work together how long would they take to copy the dissertation?
? minutes
Found 2 solutions by checkley77, Alan3354:
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
1/8+1/14=1/x
(14+8)/8*14=1/x
22/112=1/x
22x=112
x=112/22
x=5.09 minutes working together.

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Use product/sum
--> 14*8/(14+8)
= 112/22
= 56/11
Same answer, less time finding it.