SOLUTION: The officejet printer can copy a dissertation in 22 min. The Laserjet printer can copy the same document in 8 min. If the two machines work together, how long would they take to co

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Question 347594: The officejet printer can copy a dissertation in 22 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 dissertion?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
1/22+1/8=1/X
(8+22)/(22*8)1/X
30/176=1/X CROSS MULTIPLY.
30X=176
X=176/30
X=5.867 HOURS WORKING TOGETHER.
PROOF:
1/22+1/8=1/5.867
(8+22)/22*8=.17
30/176=.17
.17=.17