Wave Optics

A light of wavelength \(500 \mathrm{~nm}\) is incident on a Young's double slit. The distance between slit and screen is \(D=1.8 \mathrm{~m}\) and distance between slits is \(d=0.4 \mathrm{~mm}\). If screen moves with a speed of \(4 \mathrm{~m} / \mathrm{s}\), then with what speed first maxima will move?