SOLUTION: Word problem.
It takes 60 minutes to fill a pond with water alone.
It takes 80 minutes to drain a pond of water alone.
How long will it take to fill the pond while it is bei
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-> SOLUTION: Word problem.
It takes 60 minutes to fill a pond with water alone.
It takes 80 minutes to drain a pond of water alone.
How long will it take to fill the pond while it is bei
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Question 436132: Word problem.
It takes 60 minutes to fill a pond with water alone.
It takes 80 minutes to drain a pond of water alone.
How long will it take to fill the pond while it is being drained at the same time? Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! consider filling or emptying the pool as 1 job.
emptying the pool = 80 minutes
so 1/80 of the job is done in 1 minute
...
Filling time = 60 minutes
1/60 of the job in 1 minute
..
difference = 1/60 -1/80
(80-60)/80*60
20/2400
1/120 of the job is done in 1 minute when both are on.
so it will take 120 minutes to fill the pool.
