6. A gas tank on a dock has a small puncture and is leaking gas at the rate of lcm / min' into a lake. It forms a circular slick that is 1 mm thick on the surface of the water. a) Find the amount of gas leaked as a function of time. b) State the radius of the slick as a function of its volume. c) State the radius of the slick as a function of time. d) What is the radius of the slick after 40 minutes?