Bovinia has a national debt of $2 trillion and Porcini has a national debt of $5.5 trillion. If Bovinia is adding $650 billion ($0.65 trillion) to its debt each year and Porcini is adding $250 billion ($0.25 trillion), in how many years will the national debt of Bovinia exceed -- that is, be greater than -- the national debt of Porcini?
