The dam

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

Result

t = 12:55 hh:mm Wrong answer

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 = 12.91666667

t = 155/12 ≈ 12.916667

Our simple equation calculator calculates it.



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