# SOLUTION: One water pump can drain a lake in 9 hours. A newer model can drain the same lake in 6 hours. How long does it take for both water pumps together to drain the lake?

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 Question 228229: One water pump can drain a lake in 9 hours. A newer model can drain the same lake in 6 hours. How long does it take for both water pumps together to drain the lake? Answer by nerdybill(6948)   (Show Source): You can put this solution on YOUR website!One water pump can drain a lake in 9 hours. A newer model can drain the same lake in 6 hours. How long does it take for both water pumps together to drain the lake? . Let x = time in hours it takes for both to drain lake then x (1/9 + 1/6) = 1 Multiply both sides by 54 (common denominator) x (6 + 9) = 54 x(15) = 54 x = 54/15 x = 3.6 hours or x = 3 hours and 36 minutes