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Three source of sound S1, S2 and S3 of e...

Three source of sound `S_1, S_2 and S_3` of equal intensity are placed in a straight line with `S_1S_2 = S_2S_3` At a point P, far away from the sources, the waye coming from `S_2`, is `120^@` ahead in phase of that from `S_1`. Also, the wave coming from `S_3" is "120^@` a head of that from S_2. What would be the resultant intensity of sound at P?

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