Waves question involving 3 people in a tunnel

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Homework Statement


Becky and Rajiv are standing at different points in a long tunnel while Naoimi adjusts her bass amplifier at one end. As Naoimi plays an 88Hz tone, BEcky cannot hear much and Raj complains that the volume is too loud. What is the minimum distance between Becky and Rajiv?(Use 343 m/s for speed of sound).



Homework Equations


v=f x lambda
L=lambda/2 x n, n being the harmonic and L being the length




The Attempt at a Solution



So I calculated the wavelength as being 3.9m for the 88hz tone and I figure Raj must be closer to Naomi then Becky but I don't understand how you would know which harmonic the tone would be so I can't use the length formula at all.
 

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No I havent. How would I even know what it looks like?