SOLUTION: It takes Burt three times as long as Phong to set up a new alarm system. Together they can set it up in 90 minutes. HOW LONG WOULD IT TAKE PHONG to set up the alarm system by himse

Question 1137526: It takes Burt three times as long as Phong to set up a new alarm system. Together they can set it up in 90 minutes. HOW LONG WOULD IT TAKE PHONG to set up the alarm system by himself?
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
Phong,
Burt,

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