SOLUTION: A water tank can be filled in seven minutes and emptied in nine minutes. If the drain is accidently left open when the tank is being filled how long does it take to fill the tank?

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Question 798922: A water tank can be filled in seven minutes and emptied in nine minutes. If the drain is accidently left open when the tank is being filled how long does it take to fill the tank?

I wasnt therw the day we were taught this
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


If the fill pipe can fill the tank in minutes, then it can fill of the tank in one minute. Likewise the drain can empty of the tank in one minute. Hence, working against one another, given that , of the tank will fill in one minute. Do the arithmetic and then take the reciprocal of the answer to get the number of minutes to fill the tank.

John

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