Answer
The relative velocity between the woman and the center of the tire is $0km/h$.
Work Step by Step
The velocity of the center of the tire is equal to the velocity of the car:
$v_t=(80km/h)i$.
The velocity of a woman riding in the car is also equal to the velocity of the car: $v_w=(80km/h)i$.
The relative velocity of the tire with respect to the woman is the velocity of the tire minus the velocity of the woman: $v_r=v_t-v_w=(80km/h)i-(80km/h)i=0km/h$
