Current Attempt in Progress

The drawing shows a loudspeaker $\backslash ($ A $\backslash )$ and point $\backslash ($ C $\backslash ),$ where a listeer is positioned. A second loudspeaker $\backslash ($ B $\backslash )$ is located somewhere to the right of A $.$ Both speakers vibrate in phase and are playing a $\backslash (68\mathrm{.}4-\backslash$mathrm$\{$Hz$\}\backslash )$ tone. The speed of sound is $\backslash (342\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ).$ What is the closest to speaker A that speaker B can be located, so that the listener hears no sound?

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