speed of image of jogger ??

Suppose while sitting in a parked car, you notice a jogger approaching towards you in the rear view mirror of R=2 m. If the jogger is running at a speed of 5m/s
, how fast is the image of the jogger moving, when the jogger is
(a) 39 m
(b) 29 m
(c) 19 m and
(d) 9 m. away ?