My cute puppy, Jenny, saw a mirror for the 1st time in its life. Thinking, of course, that it was another dog she was seeing, she started barking and running towards the mirror with a speed of 10 cm/s. Now, I started moving the mirror towards Jenny with a speed of 5 cm/s, just to mess with her. How fast will Jenny see 'the other dog' (her image) running? (The mirror is a plane mirror. Also, assume Jenny to be a point object, she's tiny, and far from the mirror, so not a bad assumption!)