Pool

Pool is filled with two water supply. The first supply fill pool for nine hours, the second for six hours. How many hours will take fill the pool when the water flows in through the first supply 3 hours and then we will open a second supply?

Correct result:

x =  5.4 h

Solution:

1/9 x +1/6•(x-3)=1

1/9•x +1/6•(x-3)=1

5x = 27

x = 27/5 = 5.4

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