calculus

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Sand falls from a conveyor belt at a rate of 20 m^3/min onto the top of a conical pile. The height of the pile is always 3/4 of the base diameter. Answer the following.

a.) How fast is the height changing when the pile is 10 m high?
Answer = m/min.

b.) How fast is the radius changing when the pile is 10 m high?
Answer = m/min.

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