A transverse wave is a moving wave in which the current is perpendicular to the direction of the wave or path of propagation. A longitudinal wave are waves in which the displacement of the median is in the direction of the propagation. 
Example:
Transverse- pond ripple
Longitudinal- crest and troff
        
                    
             
        
        
        
Lmalemwlsnlenekenfndelenekf
        
             
        
        
        
First, foremost, and most critically, you must look at the graph, and critically 
examine its behavior from just before until just after the 5-seconds point.
Without that ability ... since the graph is nowhere to be found ... I am hardly
in a position to assist you in the process.
        
             
        
        
        
Answer:
d / λ = 26.7
Explanation:
In Young's double slit experiment, constructive interference is described by the expression
    d sin θ = m λ
In the case of destructive interference we must add half wavelength (λ/2)
    d siyn θ = (m + ½) λ
Let's clear
     d / λ = (m + ½) / sin θ
Let's calculate
    d / λ = (2+ ½) / sin 5.4
    d / λ = 5 / (2 sin 5.4)
    d / λ = 26.7