A swimming pool is 20 feet wide and has transverse cross-sections which look like: If the pool is being filled at a rate of 1 cubic feet per minute, how fast is the water level rising when the depth of water is 1 feet?

We first need to express the volume of water in the pool as a function of , the depth of water in the pool.

We first need to express the volume of water in the pool as a function of , the depth of water in the pool.

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