Hi,

one pump fills a tank 2 times as fast as another pump.

Let x and  represent  their rates

If the pumps work together they fill the tank in 8 minutes. 

   |Multiplying thru by 8x so as all denominators = 1

   8 + 4 = x

    12min = x, the other pump takes 24min    

Answer by richwmiller(17219)   (Show Source): You can put this solution on YOUR website!
 8/60/x+8/60/2x=1

2/15/x+2/15/2x=1

2/15/x+1/15/x=1

3/15/x=1

1/5/x=1

1/5=x

12 minutes=x

24 minutes=2x

check

8/12+8/24=1

2/3+1/3=1







 

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