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8. Oil enters an initially empty tank at a rate of 2 kg/s through pipe 1.Oil leaves the tank from pipe 2 at 0.5 kg/s and through pipe 3 and 1kg/s. The oil has a density of 737 kg/m³. Find a) how much oil is in the tank after 30 minutes and b) how long in hours does it take to fill the cylindrical tank if it has a diameter of 2.5 m and a height of 4m?

Fig: 1

Fig: 2

Fig: 3