SOLUTION: a tank can be filled by two hoses. one requires 50 minutes to fill the tank and the other in 40 minutes. if both are used, how much time is needed to fill the tank?

Question 789305: a tank can be filled by two hoses. one requires 50 minutes to fill the tank and the other in 40 minutes. if both are used, how much time is needed to fill the tank?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of filling:
1st tank's rate: ( 1 tank filled ) / ( 50 min )
2nd tank's rate: ( 1 tank filled ) / ( 40 min )
Let ( 1 tank filled ) / ( t min ) = rate of filling with both used
-------------------

Multiply both sides by

min

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