Vector Algebra: JEE Main 2021 Mathematics question

If $\left( {\overrightarrow a + 3\overrightarrow b } \right)$ is perpendicular to $\left( {7\overrightarrow a - 5\overrightarrow b } \right)$ and $\left( {\overrightarrow a - 4\overrightarrow b } \right)$ is perpendicular to $\left( {7\overrightarrow a - 2\overrightarrow b } \right)$, then the angle between $\overrightarrow a$ and $\overrightarrow b$ (in degrees) is _______________.