Pool

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

Correct answer:

x =  5.4 h

Step-by-step explanation:


1/9 x +1/6·(x-3)=1

1/9·x +1/6·(x-3)=1

5x = 27


x = 27/5 = 5.4

x = 27/5 = 5.4

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