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Two speakers are located at two on an unknown triangle with an observer located at the...

Two speakers are located at two on an unknown triangle with an observer located at the geometric center. You do not know either the sides nor angles, so you attach pipes that are open at both ends from each speaker to the center of the triangle. One pipe has a 4th harmonic standing wave frequency of 300 Hz, and one pipe has a 5th harmonic standing of 400 Hz. What frequency can the speakers be playing for the observer to hear no sound? Use the n=0 case for destructive interference. The speed of sound is 343 m/s.          

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