Can you tell me how to solve below question ( Rerated Rates Problem)

1) When flows onto a flat surface at a rate of 5cm cube / s forming a circular puddle 10mm deep. How fast is the radius growing when the radius is 10cm? (answer: 2 decimal places)

should I use this formula --> surface area A=4?r2 ?

2)

A boat is being pulled into a dock at a constant rate of 30ft/min by a winch located 10ft above the deck of the boat. At what rate is the boat approaching the dock when the boat is 50 feet out? Enter your answer as a positive number in ft/min