SOLUTION: person A can fill a tank in 10 minutes person B can fill a tank in 20 minutes person C can fill a tank in 30 minutes how long will it take to fill the tank if they all work to

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Question 161735: person A can fill a tank in 10 minutes
person B can fill a tank in 20 minutes
person C can fill a tank in 30 minutes
how long will it take to fill the tank if they all work together?

Answer by Alan3354(21605) About Me  (Show Source):
You can put this solution on YOUR website!
person A can fill a tank in 10 minutes
person B can fill a tank in 20 minutes
person C can fill a tank in 30 minutes
how long will it take to fill the tank if they all work together?
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Add the reciprocals, then invert it.
1/10 + 1/20 + 1/30 = 11/60
The time is 60/11 minutes, or 5 5/11 minutes.