JEE Main 9 Jan 2019 Shift 2 Solved Paper

Two Carrnot engines A and B are operated in series. The first one, A, receives heat at T1 (= 600 K) and rejects to a reservoir at temperature T2. The second engine B receives heat rejected by the first engine and, in turn, rejects to a heat reservoir atT3 (= 400 K). Calculate the temperatureT2 if the work outputs of the two engines are equal :