A swimming pool is 50 m long and 20 m wide. Its depth decreases linearly along the length from 9 m to 1 m. It is initially empty and is tilled at a rate of 1 m^3/min. How fast is the water level rising 810 min after the filling begins? How long will it take to fill the pool? The water is rising at a rate of m/min 810 min after the filling begins. (Simplify your answer.)
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