SOLUTION: Three computers can print out a task in 18 min, 27 min, and 54 min, respectively. How long would it take to complete the task with all three computers working?

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Question 674485: Three computers can print out a task in 18 min, 27 min, and 54 min, respectively. How long would it take to complete the task with all three computers working?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Add their rates of printing to get
the rate with all 3 working
+1%2F18+%2B+1%2F27+%2B+1%2F54+=+1%2Ft+
Multiply both sides by +54t+
+3t+%2B+2t+%2B+t+=+54+
+6t+=+54+
+t+=+9+
It would take 9 minutes with all 3
computers working