SOLUTION: If a tank takes 20,30, and 60 minutes by three pipes to fill up seperately, how many minutes will it take to fill up with all three pipes together?

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Question 505955: If a tank takes 20,30, and 60 minutes by three pipes to fill up seperately, how many minutes will it take to fill up with all three pipes together?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Add the rate of filling
( 1 tank / 20 min ) + ( 1 tank / 30 min ) + ( 1 tank / 60 min ) = ( 1 tank / x min )
+1%2F20+%2B+1%2F30+%2B+1%2F60+=+1%2Fx+
Multiply both sides by +60x+
+3x+%2B+2x+%2B+x+=+60+
+6x+=+60+
+x+=+10+
It will take 10 min to fill tank with all 3 pipes