Two identical cylindrical tanks are filled with liquid

Two identical cylindrical tanks are filled with liquid up to level h each and have bottom openings with an area of f1 and f2, flow rates of which are equal to μ1 and μ2, respectively. The holes open at the same time.
Determine the level of y in the lower tank at the moment when the upper tank is completely empty. Find y in the particular case when μ1 = μ2 and f1 = f2, h = 1m.
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