The chord of an airplanes thin wing is 2 m and it is flying

Question

The chord of an airplane's thin wing is 2 m and it is flying at 300 km/h. Calculate the friction drag for unit width

(a) assuming laminar flow on both the upper and lower surfaces and

(b) assuming turbulent flow on both surfaces. Assume that μ = 1.8 × 10^-5 N s/m² and ρ = 1.2 kg/m³.