$2.(2\mathrm{.}4)$ Starting from a pillar, you run $200$ m east $($the $+$x direction$)$ at an average speed of $5\mathrm{.}0$ m$/$s and then run $280$ m west at an average speed of $4\mathrm{.}0$ m$/$s to a post.

a$.$ Calculate your average speed from pillar to post and

b$.$ Calculate your average velocity from pillar to post