Flying Circus of Physics

An ion's position vector is initially vec$(r)=(8\mathrm{.}1m)hat(i)+(-6\mathrm{.}7m)hat(j)+(1\mathrm{.}1m)hat(k),$ and $3\mathrm{.}8$ s later it is vec$(r)=(8\mathrm{.}6m)hat(i)+(7\mathrm{.}3m)hat(j)+(-1\mathrm{.}1m)hat(k).$ In unit$-$vector notation, what is its average velocity during the $3\mathrm{.}8s?$

Number

hat$(i)$

widehat$(j)$

widehat$(k)$ Units