Pool
The pool is filled with two water supplies. The first supply fills the 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 three hours, and then we open a second supply?
Correct answer:
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You need to know the following knowledge to solve this word math problem:
algebraUnits of physical quantitiesthemes, topicsGrade of the word problem
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