$2)$ An airplane increases its speed from $100$ m$/$s to $160$ m$/$s$,$ at the average rate of $15$ m$/$s$.$ How much $2)$ time does it take for the complete increase in speed?A$)0\mathrm{.}25$ sB$)0\mathrm{.}0577$ sC$)8\mathrm{.}0$ sD$)4\mathrm{.}0$ sE$)17\mathrm{.}3$ s