Could you help with numbers 17-24?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

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

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?