#importing modules
import math
from __future__ import division
#Variable Declaration
A=92.9; #absorption(m**2)
V=2265; #volume(m**3)
#Calculation
T1=0.161*V/A; #reverberation time of hall without audience(seconds)
T2=0.161*V/(A*2); #reverberation time of hall with audience(seconds)
#Result
print "reverberation time of hall without audience is",round(T1,1),"seconds"
print "reverberation time of hall with audience is",round(T2,3),"seconds"