The velocity of sound in air at 20^@ C a...

The velocity of sound in air at `20^@ C` and 1 atm pressure in `344.2 m//s`. At `40^@C` and 2 atm pressure, the velocity of sound in air is

A

`350m//s`

B

`356 m//s`

C

`363 m//s`

D

`370 m//s`

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