SOLUTION: A tank can be filled by one pipe in 30 minutes & emptied by another in 50ins,if both pipes are open, how long will it take to fill the tank

Question 99723: A tank can be filled by one pipe in 30 minutes & emptied by another in 50ins,if both pipes are open, how long will it take to fill the tank
Answer by Adam(64) (Show Source): You can put this solution on YOUR website!
If first pipe fills the whole tank in 30 minutes, then in one it fills and if second one empties the tank in 50 minutes then it empties of tank in one minute. We can write ,this expresses the state of tank after 1 minute.We can subtract and get = after 1 minute of tank will be filled. By dividing 150 by 2 we can determine how long will it take to fill the whole tank.I takes 75 minutes.
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