Thread: Related rates (cone) problem

Question:
"Water is leaking out of an inverted conical tank at a rate of cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height meters and the diameter at the top is meters. If the water level is rising at a rate of centimeters per minute when the height of the water is meters, find the rate at which water is being pumped into the tank in cubic centimeters per minute. Note: Let "R" be the unknown rate at which water is being pumped in. Then you know that if is volume of water, . Use geometry (similar triangles?) to find the relationship between the height of the water and the volume of the water at any given time. Recall that the volume of a cone with base radius r and height h is given by ."

I keep getting this wrong. I was hoping someone could point out my mistake. (My work is attached)

Any help would be greatly appreciated!
Thanks in advance!

Actually, I found a few problems with my previous attachment and I'm attaching a new version of my work but I still don't get the right answer.

I'd appreciate it if someone could give me some help.
Thanks in advance!