In Young's Double slit experiment if the two slits and simultaneously iluminated with light of different wavelength the how do you find the distance between the minimas?

THIS NOT POSSIBLE BECAUSE WHEN YOU USE LIGHT OF DIFFERENT WAVELENTH THEN THE SOURCES DO NOT REMAIN CHERENT AND THE POSITION AS WELL AS INTENSITY OF MAX AND MINIMA CHANGES SIMULTANEOUSLY. THAT IS WHY YOUNG USED ONE SOURCE AND MADE THEM TO PASS THROUGH THE TWO NARROW SLITS. THE MAIN CAUSE OF INTERFERENCE IDS THE PATH DIFFERENCESUPERPOSITION. ALSO WHEN YOU USE TRIGNOMETRY THEN YOU WOULD HAEE SEEN THAT THE  ANGLES OF WAVES COME IN SUCH A FORMULA THAT COULD BE EXPLAINE BUT HERE IT CAN T  NOT BE SOLVED BY MATHEMATICS