A bowling ball moves down the lane from $x_1=2\mathrm{.}20cm$ to $x_2=-4\mathrm{.}40cm$ during the time interval from $t_1=3\mathrm{.}00s$ to $t_2=7\mathrm{.}00s.$

A bowling ball moves down the lane from $x_1=2\mathrm{.}20cm$ to $x_2=-4\mathrm{.}40cm$ during the time interval from $t_1=3\mathrm{.}00s$ to $t_2=7\mathrm{.}00s.$

What is the ball's average velocity $v_{\text{a}\text{v}\text{e}\text{r}\text{a}\text{g}\text{e}\text{,}x}$ in centimeters per second?

$v_{\text{a}\text{v}\text{e}\text{r}\text{a}\text{g}\text{e},x}=$

$c\frac{m}{s}$