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I have posted a link there to this topic so the OP can see my work.Another related rates problem?

Sand falls from a conveyor belt at a rate of 30 m^3/min onto the top of a conical pile. The height of the pile is always the same as the base diameter. Answer the following.

a.) How fast is the height changing when the pile is 8 m high?

Answer = m/min.

b.) How fast is the radius changing when the pile is 8 m high?

Answer = m/min.