Imagine that you are a marine biologist and want to determine the boundary layer associated with the flow of ocean water around the fin of a stingray. You know that the fin is 1.3 ft in length and the cruising speed of a stingray is 25 km/hr. what is the boundary layer thickness 6 inches from the leading edge of the fin? Assume the kinematic viscosity of ocean water is 1 mm^2/s.