SOLUTION: An office Jet printer can copy dissertation in 12 minutes. A Laser Jet printer can copy the same document in 18 minutes. If the two machines work together, how long would they take

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Question 303298: An office Jet printer can copy dissertation in 12 minutes. A Laser Jet printer can copy the same document in 18 minutes. If the two machines work together, how long would they take to copy the dissertation.
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = time it will take machines to work together
1/12 + 1/18 = 1/x
Can you find x now?