For this problem we are adding to find a future time.  

We can add $\displaystyle 4$ hours to $\displaystyle 8$ and $\displaystyle 31$ minutes to $\displaystyle 0$. 

$\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space12}$   $\displaystyle \frac{\begin{array}[b]{r}0\\ +\ 31\end{array}}{ \ \ \ \space 31}$

He returned home at $\displaystyle 12:31$

For this problem we are adding to find a future time.  

We can add $\displaystyle 4$ hours to $\displaystyle 8$ and $\displaystyle 37$ minutes to $\displaystyle 5$. 

$\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space12}$   $\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 37\end{array}}{ \ \ \ \space 42}$

He returned home at $\displaystyle 12:42$

For this problem we are adding to find a future time.  

We can add $\displaystyle 4$ hours to $\displaystyle 8$ and $\displaystyle 22$ minutes to $\displaystyle 22$. 

$\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space12}$   $\displaystyle \frac{\begin{array}[b]{r}22\\ +\ 22\end{array}}{ \ \ \ \space 44}$

He returned home at $\displaystyle 12:44$

For this problem we are adding to find a future time.  

We can add $\displaystyle 4$ hours to $\displaystyle 8$ and $\displaystyle 11$ minutes to $\displaystyle 41$. 

$\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space12}$   $\displaystyle \frac{\begin{array}[b]{r}41\\ +\ 11\end{array}}{ \ \ \ \space 52}$

He returned home at $\displaystyle 12:52$

For this problem we are adding to find a future time.  

We can add $\displaystyle 4$ hours to $\displaystyle 8$ and $\displaystyle 8$ minutes to $\displaystyle 4$. 

$\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space12}$   $\displaystyle \frac{\begin{array}[b]{r}4\\ +\ 8\end{array}}{ \ \ \ \space 12}$

He returned home at $\displaystyle 12:12$

For this problem we are adding to find a future time.  

We can add $\displaystyle 2$ hours to $\displaystyle 5$ and $\displaystyle 26$ minutes to $\displaystyle 18$. 

$\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 2\end{array}}{ \ \ \ \space7}$   $\displaystyle \frac{\begin{array}[b]{r}18\\ +\ 26\end{array}}{ \ \ \ \space 44}$

He returned home at $\displaystyle 7:44$

For this problem we are adding to find a future time.  

We can add $\displaystyle 2$ hours to $\displaystyle 5$ and $\displaystyle 19$ minutes to $\displaystyle 26$. 

$\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 2\end{array}}{ \ \ \ \space7}$   $\displaystyle \frac{\begin{array}[b]{r}26\\ +\ 19\end{array}}{ \ \ \ \space 45}$

He returned home at $\displaystyle 7:45$

For this problem we are adding to find a future time.  

We can add $\displaystyle 2$ hours to $\displaystyle 5$ and $\displaystyle 59$ minutes to $\displaystyle 10$. 

$\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 2\end{array}}{ \ \ \ \space7}$   $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 49\end{array}}{ \ \ \ \space 59}$

He returned home at $\displaystyle 7:59$

For this problem we are adding to find a future time.  

We can add $\displaystyle 2$ hours to $\displaystyle 5$ and $\displaystyle 15$ minutes to $\displaystyle 40$. 

$\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 2\end{array}}{ \ \ \ \space7}$   $\displaystyle \frac{\begin{array}[b]{r}40\\ +\ 15\end{array}}{ \ \ \ \space 55}$

He returned home at $\displaystyle 7:55$

For this problem we are adding to find a future time.  

We can add $\displaystyle 2$ hours to $\displaystyle 5$ and $\displaystyle 35$ minutes to $\displaystyle 0$. 

$\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 2\end{array}}{ \ \ \ \space7}$   $\displaystyle \frac{\begin{array}[b]{r}0\\ +\ 35\end{array}}{ \ \ \ \space 35}$

He returned home at $\displaystyle 7:35$