An electron starting from rest has a velocity that increases linearly with the time that is $v = kt,$ where $k = 2m/{\sec ^2}$. The distance travelled in the first $3 \,seconds$ will be………..$m$

If average and instantaneous velocities are same, then what is the type of motion ?

Two cars $P$ and $Q$ start from a point at the same time in a straight line and their positions are represented by $ x_p(t)=at+bt^2 $ and $x_Q(t)= ft- t^2$. At what time do the cars have the same velocity $?$