Simple Harmonic Motion

In a medium, the phase difference between two particles separated by a distance '\(x\)' is \(\left(\frac{\pi}{5}\right)^{\text {c }}\). If the frequency of the oscillation of particles is \(25 \mathrm{~Hz}\) and the velocity of propagation of the waves is \(75 \mathrm{~m} / \mathrm{s}\), then the value of \(x\) is