Tributaries

The pool can be filled with two different tributaries. The first inflow would fill the pool in 18 hours, both in 6 hours. How many hours would the pool filled with a second inflow?

Correct result:

x =  9 h

Solution:

6 (1/18+1/x)=1 y=1/x  6 (1/18+y)=1  108y=12  y=190.111111  x=1/y=1/0.1111=9 h



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