Two vertical circular cylindrical tanks are connected near the bottom by a short tube having a cross-sectional area of 725 cm?. The inside diameters of the tanks are 3m and 1.5 m, respectively. The tanks contain oil. With the valve in the tube closed, the oil surfaces are 4m in the larger tank and 0.6 m in the smaller above the tube. With c=0.78, find the time required for the surfaces to equalize following a quick opening of the valve. Assume the properties of the tube to be similar to that of an orifice.

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