Light waves with two different wavelengths

Light waves with two different wavelengths, 632 nm and 474 nm, pass simultaneously through a single slit whose width is 6.59 10-5 m and strike a screen 1.13 m from the slit. Two diffraction patterns are formed on the screen. What is the distance (in cm) between the common center of the diffraction patterns and the first occurrence of a dark fringe from one pattern falling on top of a dark fringe from the other pattern?