How do you find average power?

A 5011kg car traveling at 75 m/s is at the foot a hill that rises 594m in 5.6 km. At the top of the hill, the speed of the car is 3 m/s. The acceleration of gravity is 9.81 m/s^2. uming constant acceleration, find the averge power delivered by the car's engine, neglecting any internal frictional lossses. Answer in KW