<PRE><B>Question 376189</B>
Faucet A fills a tank in 6 minutes, and faucet B fills the same tank in 12 minutes. If they are opened together to fill the same tank, how long will it take to fill the tank?

Let x = the number of minutes it takes to fill the tank if Faucets A and B are  
        opened together

x(1/6 + 1/12) = 1
x(2/12 + 1/12)= 1
         3x/12= 1
           x  = 4

It takes 4 minutes to fill the tank if Faucets A and B are opened together.


</PRE>