Wave Optics

In Young's double slit experiment, carried out with light of wavelength \(5000~\mathop A\limits^o\), the distance between the slits is \(0.3 \mathrm{~mm}\) and the screen is at \(200 \mathrm{~cm}\) from the slits. The central maximum is at \(x=0 \mathrm{~cm}\). The value of \(x\) for third maxima is __________ \(\mathrm{mm}\).