AIPMT 2013 Physics and Chemistry Paper

In Young's double slit experiment, the slits are 2‌mm apart and are illuminated by photons of two wavelengths λ1=12000Å˙A and λ2=10000Å. At what minimum distance from the common central bright fringe on the screen 2m from the slit will a bright fringe from one interference pattem coincide with a bright fringe from the other ?