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# A body vibrating with a certain frequency sends waves of wavelength 15 cm in a medium $\mathit{A}\;$ and 20 cm in medium $\mathit{B}\;$. If $\mathit{v}\;$ of waves in $\mathit{A}\;$ is 120 m/s. That in $\mathit{B}\;$ will be ................ m/s.

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