A source of sound revloving in a circle ...

A source of sound revloving in a circle of radius `5 m` is emitting a signal of frequency `320 Hz`. It completes one revolution in `(pi)/(2)` seconds. If the difference between maximum and minimum frequencies of the signal heard at a point `30 m` from the centre of the circle `= (25)/(7) P`. Find `P`.
(Given speed of sound `= 330 ms^(-1)`)]

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