### Home > PC3 > Chapter 7 > Lesson 7.2.4 > Problem 7-120

How fast is the water evaporating when the container is full?

Determine the radius when the cone is filled.

Set up and solve a proportion relating the area with the rate of evaporation.

How fast is the water evaporating when it is half full? (Reminder

.)When the cone is full, it has

m ^{3}of water in it.

What is the volume of water in the cone when it is half full?Calculate

*r*when the cone is half full. Then set up a proportion with area and evaporation rate similar to the one in part (a).