Let $P$ be an interior point of triangle $ABC$. Let $a,b,c$ be the sidelengths of triangle $ABC$ and let $p$ be it's semiperimeter. Find the maximum possible value of
$$ \min\left(\frac{PA}{p-a},\frac{PB}{p-b},\frac{PC}{p-c}\right)$$
taking into consideration all possible choices of triangle $ABC$ and of point $P$.

by Elton Bojaxhiu, Albania
1. **Consider the setup**: Let \( P \) be an interior point of triangle \( ABC \). Let \( a, b, c \) be the side lengths of triangle \( ABC \) and let \( p \) be its semiperimeter, i.e., \( p = \frac{a+b+c}{2} \).

2. **Equilateral triangle case**: If \( P \) is the center of an equilateral triangle \( ABC \), then the distances from \( P \) to the vertices \( A, B, \) and \( C \) are equal. Let this common distance be \( PA = PB = PC \). In an equilateral triangle, the distance from the center to any vertex is \( \frac{2}{3} \) of the altitude. The altitude of an equilateral triangle with side length \( a \) is \( \frac{\sqrt{3}}{2}a \). Therefore, \( PA = \frac{2}{3} \cdot \frac{\sqrt{3}}{2}a = \frac{\sqrt{3}}{3}a \).

3. **Calculate the ratio**: For an equilateral triangle, \( p = \frac{3a}{2} \). Thus,
   \[
   \frac{PA}{p-a} = \frac{\frac{\sqrt{3}}{3}a}{\frac{3a}{2} - a} = \frac{\frac{\sqrt{3}}{3}a}{\frac{a}{2}} = \frac{\frac{\sqrt{3}}{3}a}{\frac{a}{2}} = \frac{2\sqrt{3}}{3} = \frac{2}{\sqrt{3}}.
   \]
   Similarly, \( \frac{PB}{p-b} = \frac{2}{\sqrt{3}} \) and \( \frac{PC}{p-c} = \frac{2}{\sqrt{3}} \).

4. **Assume a contradiction**: Assume there exists a point \( P \) in \( \triangle ABC \) such that
   \[
   \min\left(\frac{PA}{p-a}, \frac{PB}{p-b}, \frac{PC}{p-c}\right) > \frac{2}{\sqrt{3}}.
   \]

5. **Use Ptolemy's inequality**: Let \( A_1, B_1, C_1 \) be the touchpoints of the incircle of \( \triangle ABC \) with sides \( BC, CA, AB \) respectively. By Ptolemy's inequality for quadrilateral \( AC_1PB_1 \),
   \[
   PA \cdot B_1C_1 \leq AB_1 \cdot PC_1 + AC_1 \cdot PB_1 = (p-a)(PB_1 + PC_1).
   \]
   Given the assumption, we have
   \[
   (p-a) < \frac{\sqrt{3}}{2}PA \implies PA \cdot B_1C_1 < \frac{\sqrt{3}}{2}PA(PB_1 + PC_1).
   \]
   Dividing both sides by \( PA \),
   \[
   B_1C_1 < \frac{\sqrt{3}}{2}(PB_1 + PC_1).
   \]

6. **Analogous inequalities**: Similarly, for \( BA_1PC_1 \) and \( CB_1PA_1 \),
   \[
   \frac{2}{\sqrt{3}}A_1C_1 < PA_1 + PC_1 \quad \text{and} \quad \frac{2}{\sqrt{3}}B_1C_1 < PA_1 + PB_1.
   \]

7. **Interior point consideration**: Notice that \( P \) must be in the interior of \( \triangle A_1B_1C_1 \). Otherwise, if \( P \in \triangle AC_1B_1 \), then \( PA < AC_1 = p-a \implies \frac{PA}{p-a} < 1 < \frac{2}{\sqrt{3}} \), which contradicts the assumption.

8. **Examine the inequality**: Let \( \angle B_1PC_1 = \varphi \). Using the Cosine Law for \( \triangle B_1C_1P \),
   \[
   \frac{2}{\sqrt{3}}B_1C_1 < PB_1 + PC_1 \implies \frac{4}{3}B_1C_1^2 < (PB_1 + PC_1)^2.
   \]
   Expanding and simplifying,
   \[
   \frac{1}{3}(PB_1^2 + PC_1^2) < 2PB_1PC_1 \left(1 + \frac{4}{3}\cos\varphi\right) \leq (PB_1^2 + PC_1^2) \left(1 + \frac{4}{3}\cos\varphi\right).
   \]
   This implies
   \[
   \cos\varphi > \frac{1}{2} \implies \varphi < 120^\circ.
   \]

9. **Sum of angles**: By manipulating the other two inequalities similarly, we get
   \[
   \angle A_1PB_1 + \angle B_1PC_1 + \angle C_1PA_1 < 120^\circ + 120^\circ + 120^\circ = 360^\circ,
   \]
   which is a contradiction since \( P \) is in the interior of \( \triangle A_1B_1C_1 \).

10. **Conclusion**: Therefore, the assumption is false, and we have
   \[
   \min\left(\frac{PA}{p-a}, \frac{PB}{p-b}, \frac{PC}{p-c}\right) \leq \frac{2}{\sqrt{3}}.
   \]

The final answer is \( \boxed{ \frac{2}{\sqrt{3}} } \).