A Nail salon opens at 10am. During the busy Christmas period people start arriving at 9 am and queue in front of the salon to wait for the salon opening. The arrivals follow a non-homogeneous Poisson...

Extracted text: A Nail salon opens at 10am. During the busy Christmas period people start arriving at 9 am and queue in front of the salon to wait for the salon opening. The arrivals follow a non-homogeneous Poisson process with rate function A(t) = 25t^2. What the average waiting time of a person who is present at the nail salon at 10 am.