Solve the Problem $-1 \mathrm{in} . / \mathrm{s}$ Find the Rate at Which Water Is Being Drained

Multiple Choice

Solve the problem.
-A container, in the shape of an inverted right circular cone, has a radius of 4 inches at the top and a height of 8 inches. At the instant when the water in the container is 5 inches deep, the surface level is falling at the rate of $-1 \mathrm{in} . / \mathrm{s}$ . Find the rate at which water is being drained.

A) $-28.8 \mathrm{in} .3 / \mathrm{s}$
B) $-18.75 \mathrm{in} .3 / \mathrm{s}$
C) -19.63 in. $3 / \mathrm{s}$
D) $-39.27 \mathrm{in.} 3 / \mathrm{s}$