A projectile is thrown with a velocity of $10 \sqrt{2} \mathrm{~ms}^{-1}$ at an angle of $45^{\circ}$ with the horizontal. The time interval between the moments when the speeds are $\sqrt{125} \mathrm{~ms}^{-1}$ is $\left(g=10 \mathrm{~ms}^{-2}\right)$