sand is poured into a right circular cylinder of radius 1/2m along its x-axis. once sand is completely covers the…

sand is poured into a right circular cylinder of radius 1/2m along its x-axis. once sand is completely covers the bottom a right circular cone is formed on the top.
(a) if 0.02 m^3 of sand enters the container every minute, how fast is the top of the sand pile rising?
(b) how fast is the sand risig along the side of the cylinder?