A paper cup has the shape of a cone with a height 10 cm and a radius of 3 cm (at the top). If the water is poured into the cup at a rate of 2 cm^3/s, how fast is the water level rising when the water is 5cm deep?

A paper cup has the shape of a cone with a height 10 cm and a radius of 3 cm (at the top). If the water is poured into the cup at a rate of 2 cm^3/s, how fast is the water level rising when the water is 5cm deep?

I guess that would be a Right Circular cone?
The important leap is that the filled portion of the cup is always similar to any other filled portion of the cup. This makes (3/10)*Height = Radius