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Q)

The sound waves of wavelengths 5 m and 6 m formed 30 beats in 3 seconds. The velocity of sound is :


( A ) $330\; ms^{-1}$
( B ) $300\; ms^{-1}$
( C ) $310\; ms^{-1}$
( D ) $320\; ms^{-1}$

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