If $A(6, 5)$ and $B(4, 3)$,then the midpoint of $\overline{AB}$ is..........

The coordinates of the midpoint of the line segment joining $(8, 10)$ and $(4, 8)$ are ..............

If the vertices of $\Delta ABC$ are $A(x_{1}, y_{1})$,$B(x_{2}, y_{2})$,and $C(x_{3}, y_{3})$,then the centroid of $\Delta ABC$ is........

The point $P(3, b)$ divides the line segment joining $A(1, 2)$ and $B(4, 5)$ in the ratio $2:1$ from $A$. Find the value of $b$.

$\overline{ AB }$ is given. If $P$ is a point on $\overline{ AB }$ such that $A - P - B$,then $P$ divides $\overline{ AB }$ from $B$ in the division ratio $\ldots \ldots \ldots \ldots$

$A(k, 2)$ and $B(3, 5)$ are the given points. If the point $P(t, t)$ divides the line segment $\overline{AB}$ in the ratio $k:1$ starting from $A$, find the value of $k$.