A reversible heat engine A (based on carnot cycle) absorbs heat from a reservoir at 1000K and rejects heat to a reservoir at T2. A second reversible engine B absorbs, the same amount of heat as rejected by the engine A, from the reservoir at T2 and rejects energy to a reservoir at 360K.If the efficiencies of engines A and B are the same then the temperature T2 is
(A) 680 K
(B) 640 K
(C) 600 K
(D) None of these
