A rolling ball moves from Part A

A rolling ball moves from $x_1=8\mathrm{.}5cm$ to $x_2=-4\mathrm{.}6cm$ during the time from $t_1=3\mathrm{.}3s$ to $t_2=6\mathrm{.}0s.$

What is its average velocity over this time interval?

Express your answer using two significant figures.