Tsunamis are dangerous! Scientists use the formula $\displaystyle{s}=\sqrt{{{9.8}{d}}}\usepackage{cmbright}\Huge\$ to calculate the speed (s) of the tsunami (in meters per second ) based on the depth (d) of the ocean (in meters). The 9.8 refers to the acceleration of the tsunami due to gravity, in meters per square second. What is the depth of the ocean (to the nearest meter) if the tsunami is moving at a speed of 320 meters per second?