Answer
130 W.
Work Step by Step
The patient has a constant velocity, so the net force parallel to the plane is 0. Write Newton’s second law for forces parallel to the plane.
$$F_p-mgsin \theta = 0$$
$$F_p=mgsin \theta$$
Now calculate the power.
$$P=F_p v = mgv sin \theta = (75kg)(9.8 m/s^2)(3100m/3600s)sin 12^{\circ}\approx 130W$$
