Sense of Direction

If I'm walking toward the back of a moving bus, what speed am I traveling and in which direction?

And if I'm walking toward the back of a moving bus, driving on the surface of this planet hurtling around the sun, what speed am I traveling, and again, in which direction?

And if I'm walking toward the back of a moving bus, crossing the surface of this planet hurtling around the sun, the sun a speck in this galaxy careening through the universe, what speed am I traveling, and again, in which direction?

I guess I want to know,

Where am I going and how am I getting there?