I need help very fast, please! (It's two different problems)

In a tWCI-Sllt experiment. a thirclcrrder bright fringe is observed at 25cm away from the central bright fringe. The wavelength of light is. 595 nm. and the pattern is created at 2.0m away from the elite. a] How far apart are the two Slits? b] What is the linear distance from the central bright fringe to the fifth crrcler dark fringe? 1IF'Ir'hat is the minimum thickness of a soap bubble film with reactit'e index 1.50 that results in a constructive interference in the reected light if this lm is illuminated by a beam of light of wavelength 53D 11.1117r