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Water is supplied to a tank via an inlet pipe with a diameter of 8-cm at a velocity of 8 m/s. Simultaneously, water exits the tank through a 5-cm discharge pipe at a velocity of 4 m/s. The tank has a height H of 3 m and a diameter D of 1.8 m. If initially the water level in the tank h is 0.4 m, how many seconds will it take to fill up the tank? Express the answer in seconds. H h D