Posted by **Avi** on Thursday, September 27, 2012 at 7:01pm.

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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