A bottle with a volume of 187 U. S. fluid gallons is filled at the rate of 1.8 g/min. (Water has a density of 1000 kg/m3, and 1 U.S. fluid gallon = 231 in.3.) In years, how long does the filling take?
well, we all know that 1000kg/m^3 = 1000g/cm^3
187gal * 231in^3/gal * (2.54cm/1in)^3 * 1000g/cm^3 * 1min/1.8g * 1yr/(365.25*1440 min) = ___ yr