Water & Wastewater engineering problem (Chemical engineering)

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Calculate the 1-day BOD and Ultimate BOD (BOD) for a wastewater with a 5-day BOD of 285ppm at 20C. The BOD rate constant k (base e) is 0.2 days 7. How long is required for a 90% reduction in BOD? If the same wastewater were at 30C, how long would be required for a 90% reduction? How long would be required for the same reduction at 15C