Sunil drives $5\text{km}$ from point A towards the west. He then takes a left turn and drives $6\text{km}$. He again takes a left turn and drives $11\text{km}$. He then takes a left turn and drives $6\text{km}$. He finally takes a right turn and drives $6\text{km}$ to arrive at point B. How much and in which direction does he have to drive to return to point A? (All the turns are $90^{\circ }$ turns only.)

Let us trace Sunil's path step-by-step by considering point A as the starting reference origin $(0,0)$:
1. Starts at point A: $(0,0)$
2. **Drives $5\text{km}$ West:** New position is $(-5,0)$.
3. **Takes a left turn and drives $6\text{km}$:** Facing West, a left turn leads towards the South direction. New position is $(-5,-6)$.
4. **Takes a left turn and drives $11\text{km}$:** Facing South, a left turn leads towards the East direction. New position becomes:

$$(-5+11,-6)=(6,-6)$$

5. **Takes a left turn and drives $6\text{km}$:** Facing East, a left turn leads towards the North direction. New position becomes:

$$(6,-6+6)=(6,0)$$

6. **Takes a right turn and drives $6\text{km}$ to arrive at point B:** Facing North, a right turn leads towards the East direction. The final position of point B is:

$$(6+6,0)=(12,0)$$

Now, point B is located at $(12,0)$, which is exactly $12\text{km}$ to the East of point A $(0,0)$.

To return to point A from point B, Sunil must travel a distance of $12\text{km}$ in the opposite direction (towards the West).

Thus, he has to drive **$12\text{km}$ towards the west**.