# This is what I produced with your help in class.
#
# The volume of the Great Lakes was given in the problem (page 79).
# The area of the contiguous 48 US states courtesy of
#     http://en.wikipedia.org/wiki/Contiguous_United_States

volume = 22810       # km**3
area   = 8080464.3   # km**2

depth_in_km    = volume / area
depth_in_miles = depth_in_km *  0.621371
depth_in_feet  = depth_in_miles * 5280

print("The contiguous US would be under", depth_in_feet, "feet of water.")