The Queen is weaker than two Rooks if the hostile King is protected against Checks, otherwise it may be stronger. _ceteris paribus_, it would appear, the Queen is a trifle weaker than two Rooks.
White plays here R-QB3, then R(R1)-QB1, thus doubling the Rooks to assail the BP and winning it. To win the RP would, it is true, be difficult, because the Rooks have to protect the King against Checks. It is evident, however, that the Rooks have the initiative and that Black's hope is merely to Draw by Perpetual Check.