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## Homework Statement

Sand falls from a conveyor belt at the rate of 10 m^3/min onto the top of a conical pile. The height of the pile is always three-eighths of the base diameter. How fast are the a) height and b) radius changing when the pile is 4m high?

## Homework Equations

h = 3/8 * 2r

## The Attempt at a Solution

I'm not sure where to start. I just need a small hint.