# The dam

The water reservoir is filled with first tributary for 25 hours second tributary for 35 hours. Some time were both inlets open, then a second tributary closed and the tank was filled in four hours. What time water flowed from both tributaries? (Expressed in hours and minutes)

Result

t = 12:55 hh:mm ### Step-by-step explanation:

1/25 t + 1/35 (t+4) = 1

1/25•t + 1/35•(t+4) = 1

12t = 155

t = 155/12 ≈ 12.916667

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