2 questions.. volume and rate of change?

Gday.

If anyone can show me how to do these i appreciate it muchly.

Im on a 2 week break with an exam first day back and got no idea what to do with these questions..

Question 1

Find the volume of the largest circular cone that can be cut from a solid sphere of radius 4cm.

Question 2

A boat is 2 meters below the level of a dock, is being pulled towards the dock by a rope. If the rope is pulled in at 0.1m/s how fast is the boat moving threw the water when 5 meters of rope remains between the boat and the dock

Thanks in advanced for anyone whose able to help.

Dave.