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We can fill the pool with two inflow pipes. The first pipe fill in 24 hours and the second in 16 hours. How long did the pool fill if the first tube was open for the first 4 hours and then we opened both inlets?

Correct answer:

t =  12 h

Step-by-step explanation:

t1=24 h t2=16 h  t/t1+(t4)/t2=1 t/24+(t4)/16=1  5t=60  t=560=12  t=12=12 h

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