A bakery has a special computer controlled machine that decorates cakes that have been baked and prefrosted. It takes exactly 60 seconds for the machine to decorate the top and sides of a cake. The machine is provided cakes by an employee that prefrosts them. The employee prefrosts cakes at an average rate of 50 per minute.

a. On average, how many cakes are in line waiting to be decorated?

b. What is the waiting time in line in seconds?