SOLUTION: the officejet printer can copy lisa's dissertation in 16 min. the laserjet printer can copy the same document in 18 min. if the two machines work together , how long would they tak

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Question 969961: the officejet printer can copy lisa's dissertation in 16 min. the laserjet printer can copy the same document in 18 min. if the two machines work together , how long would they take to copy the dissertation?
Answer by lwsshak3(11628) About Me  (Show Source):
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the officejet printer can copy lisa's dissertation in 16 min. the laserjet printer can copy the same document in 18 min. if the two machines work together , how long would they take to copy the dissertation?
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1/16=work rate of office jet printer
1/18=work rate of laser jet printer
let x=time it would take two machines work together to copy the dissertation.
1/x=their work rate
isum of indv work rates=work rate working together
1%2F16%2B1%2F18=1%2Fx
lcd: 16*18=288
18+16=288/x
34x=288
x=8.47
if the two machines work together , how long would they take to copy the dissertation? 8.47 min