Ms Devine has two rectangular structures in her backyard. The dimensions of the pool are 5 feet by 6 feet. The dimension of the fire pit are 7 feet by 8 feet. The length of the square shaped backyard is 15 feet. What is the area of the yard that is not covered by the pool and the fire pit?

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min