Q 1174801756.     The wavelengths of two sound notes in air are `40/195m` and 4`0/193m`. Each note produces `9` beats per second separately with a third note of fixed frequency. The velocity of sound in air in `m/s` is :

EAMCET 2011
A

` 360`

B

`320`

C

`300`

D

`340`

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