Physics - Vectors Question with Solution | TestHub

The x, y components of vector $\overrightarrow{\mathrm{P}}$ have magnitudes 1 and 3 and the $\mathrm{x},\mathrm{y}$ components of resultant of $\overrightarrow{\mathrm{P}}$ and $\overrightarrow{\mathrm{Q}}$ have magnitudes 5 and 6 respectively. What is the magnitude of $\overrightarrow{\mathrm{Q}}$ ?