A spherical balloon is to be deflated so that its radius decreases at a constant rate of 5 cm/min. At what rate must air be removed when the radius is  5 cm?

A right triangle originally has a base length of 1 cm and a height of 4 cm. At time ?=0t=0 minutes, the base begins to grow at 1 cm/min and the height begins to grow at 2 cm/min. Find the rate at which the area of the triangle is increasing at ?=5t=5minutes. Include correct units in your final answer.

A spherical balloon is to be deflated so that its radius decreases at a constant rate of 15 cm/min. At what rate must air be removed when the radius is 9 cm?

The top of a ladder slides down a vertical wall at a rate of 0.15 m/s. At the moment when the bottom of the ladder is 3 m from the wall, it slides away from the wall at a rate of 0.2 m/s. How long is the ladder?