Address the question and show work please

Part 1 of 3 Points: 0 of 1 Save An inverted conical water tank with a height of 14 ft and a radius Let V be the volume of water in the tank and let h be the depth of 7 ft is drained through a hole in the vertex at a rate of 2 fts / s of the water. Write an equation that relates V and h. (see figure). What is the rate of change of the water depth when the water depth is 5 ft? (Hint: Use similar triangles.) (Type an exact answer, using it as needed.) 7 ft 14 ft Outflow 2 ft /s