SOLUTION: if 3 water pumps can empty a water tank in 80 minutes, it will take 4 pumps ? minutes to empty the same tank.

Question 811549: if 3 water pumps can empty a water tank in 80 minutes, it will take 4 pumps ? minutes to empty the same tank.
Found 2 solutions by richwmiller, josgarithmetic:
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
3^80=
240 work minutes
240/4=60 minutes for four pumps

Answer by josgarithmetic(39628) (Show Source): You can put this solution on YOUR website!
If 80 minutes for 3 pumps, then 3 times longer for just 1 pump.
One pump empties the water tank in minutes.

FOUR pumps go at the rate of tanks per minute. This is 60 minutes for four pumps.
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