Engineering Physics

A hall has dimension $10,\mathrm{m} \times 8,\mathrm{m} \times 6,\mathrm{m}$, and average absorption coefficient of hall is $0.05$. Calculate the number of reflections of sound wave made per second in the hall and reverberation time of the hall. Velocity of sound wave is $340,\mathrm{m/s}$.