I drove a car for $12$ km from west to east for $2\mathrm{.}5$ min, then drove $6\mathrm{.}8$ km to the north fro $1\mathrm{.}5$min, and then drove $4\mathrm{.}6$ km to the west for $1\mathrm{.}1$ min

A$)$ what is the magnitude of the average velocity of my car in m$/$s$?$ 

B$)$ what is the average speed of my car in m$/$s$?$