SOLUTION: Can you help please! One pipe can fill a tank in 4 hours. A second pipe can fill it in 5 hours. A third pipe can fill it in 6 hours. How long would it take all three pipes to f

Question 746597: Can you help please!
One pipe can fill a tank in 4 hours. A second pipe can fill it in 5 hours. A third pipe can fill it in 6 hours. How long would it take all three pipes to fill the tank working together?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of filling
1st pipe: ( 1 tank filled ) / ( 4 hrs )
2nd pipe: ( 1 tank filled ) / ( 5 hrs )
3rd pipe: ( 1 tank filled ) / ( 6 hrs )
--------------

Multiply both sides by

hrs

All 3 pipes working together take 1 hr and 37 min

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