Question

You and a friend stand still on an escalator. A stationary observer sees you moving at a speed of 0.35 m/s. From your frame of reference, what is the speed of your friend?

Answer 1

Just imagine that the whole world spins around your escalator. You see, the world goes 0.35 m/s and your friend stands with you, so his speed is 0.

Answer 2

It's 0 m/s because you're both moving on the same machine at the same speed, so it appears that they're not moving